Aquaculture International最新文献

{"title":"The effect of protein to lipid ratios on growth, digestibility, and feed utilization of striped bass (Morone saxatilis) raised in seawater at 21 °C","authors":"Eliasid Nogueda Torres, Juan Pablo Lazo","doi":"10.1007/s10499-024-01639-5","DOIUrl":"10.1007/s10499-024-01639-5","url":null,"abstract":"<div><p>A 12-week feeding trial assessed the impact of protein-to-lipid ratios (P:L) on the growth, feed and protein utilization, digestive enzyme activity, and fillet composition of juvenile striped bass (<i>Morone saxatilis</i>) raised at summer local seawater temperature conditions (21 °C). A 3 × 2 factorial design, using three protein levels (40, 44, and 48%) and two lipid levels (12 and 16%) resulting in six diets (40:12, 44:12, 48:12, 40:16, 44:16, and 48:16) was used. Hatchery-reared fish with an initial weight of 11.4 ± 0.2 g were used. Laboratory-formulated experimental diets were randomly assigned to triplicate groups of 22 fish in 500-L tanks connected to a recirculating seawater (35.4 ± 3 ppt) system, and fish were fed manually to apparent satiation four times a day. Survival rates were higher than 96% across all treatments, remaining unaffected by dietary treatments. Fish fed the 44:12 and 48:12 diets resulted in significantly higher weight gain (WG) (274.1 ± 18.4 and 306.8 ± 19.8, respectively), final body weight (FBW) (42.4 ± 1.2 g and 47.1 ± 2.4 g, respectively), and specific growth rate (SGR) (1.6 ± 0.06 and 1.7 ± 0.06, respectively). Diets with 12% lipid resulted in feed conversion rate (FCR) values closer to 1, and the 48:16 (1 ± 0.03) treatment resulted in no significant differences compared to the 12% lipid dietary treatments. Similar trends were observed for protein efficiency ratio (PER), with comparable values for the 40:12 (2.0 ± 0.1), 44:12 (2.2 ± 0.1), 48:12 (2.0 ± 0.1), and 48:16 (2.1 ± 0.1) treatments. A strong relationship between dietary P:E ratios and SGR, PER, and FCR was observed among treatments, which helped explain the interactions between protein and lipid obtained. An estimated dietary P:E ratio between 11 and 12 is suggested for efficient protein and feed utilization for this species under our culture conditions. The apparent digestibility coefficient (ADC %) was significantly higher in the 12% lipid diets (65.01 ± 3.06%), influenced solely by lipid content. Enzyme activity for trypsin and chymotrypsin in the pyloric caeca (PC) and intestines (I) were higher in the 48:12 treatment (893.5 ± 18.1, 1087.3 ± 55.5, 12.2 ± 0.3, and 8.3 ± 0.2 Units/g organ, respectively). L-aminopeptidase activity (PC) was higher in the 48:12 treatment (1007.7 ± 101.8 Units/g organ), while L-aminopeptidase (I) had higher values in the 48:16 treatment (2217.2 ± 161.3 Units/g organ). In the case of lipase (PC), activity was higher in the 12% lipid treatments, while in the intestine, the highest activity was recorded in the 44:12 treatment (1084.4 ± 87.0). The activity of proteases, except for L-aminopeptidase (PC), directly correlated with improvements in SGR, PER, feed intake (FI), and FCR which helps explain the observed results. The Hepatosomatic index (HSI) was significantly higher in the 40:12 treatment while the liposomatic index (LSI) and viscerosomatic index (VSI) indices showed no significant differences between the 40:12, ","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"32 7","pages":"9853 - 9872"},"PeriodicalIF":2.2,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142518538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experiencing extremes: how Arapaima gigas (Schinz, 1822) deals with increasing water temperatures","authors":"Renan Diego Amanajás,&nbsp;Jhonatan Mota da Silva,&nbsp;Maria de Nazaré Paula da Silva,&nbsp;Adalberto Luis Val","doi":"10.1007/s10499-024-01637-7","DOIUrl":"10.1007/s10499-024-01637-7","url":null,"abstract":"<div><p>Temperature regulates the life cycle of aquatic organisms. However, in the current climate change scenario, the warming of the planet is putting the resilience of many species at risk, resulting in organic disturbances. In the Amazon, the effects of warming demonstrate the low thermal tolerance of species that are already living near their upper temperature limits. In this study, we evaluated the physiological and biochemical responses of specimens of forty-eight (<i>N</i> = 48) pirarucu juveniles (<i>Arapaima gigas</i>) exposed to increasing levels of water temperature (normal environmental temperature of the period — T_env), 31 °C, 34 °C, and 37 °C) for a period of 96 h, in triplicates (<i>n</i> = 12 fish per temperature). Our main findings show an increase in hematological parameters with a temperature elevation up to 34 °C, followed by suppression at 37 °C. Increases in glucose and lactate levels and reduced triglyceride levels were observed with the elevation in water temperature. Cholesterol levels remained unchanged throughout the experimental period. Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) enzymes increased at 34 and 37 °C. Oxidative stress levels were elevated at T_env and were higher at 37 °C when compared to animals at 31 °C. In the liver, the activities of superoxide dismutase (SOD) and glutathione peroxidase (GPx) enzymes increased with the increase in temperature, while the catalase (CAT) enzyme showed reduced activity at 37 °C. Thus, the data from the present study show that the pirarucu is a species that responds to increasing levels of water temperature. However, a temperature of 37 °C seems to offer a greater risk to the species’ ability to cope with the effects of higher temperatures, as it requires greater energy expenditure and induces oxidative stress. Thus, the pirarucu seems to cope better with temperatures that do not exceed 34 °C.\u0000</p></div>","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"32 7","pages":"9779 - 9794"},"PeriodicalIF":2.2,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142518424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Chromium-methionine chelate can reduce protein content in Nile tilapia diets: an analysis of growth, carcass, biochemical and hematological parameters, and economic return","authors":"Crislaine Palmeira Barbosa de Oliveira,&nbsp;Carlos Eduardo Copatti,&nbsp;Carlos Henrique da Paixão Lemos,&nbsp;Ricardo David Couto,&nbsp;Claudia Figueiredo-Silva,&nbsp;Janilson Felix da Silva,&nbsp;Luiz Vitor Oliveira Vidal","doi":"10.1007/s10499-024-01636-8","DOIUrl":"10.1007/s10499-024-01636-8","url":null,"abstract":"<div><p>This study aimed to evaluate the effects of adding chromium-methionine (Cr-meth) chelate in extruded diets containing reduced protein content on growth performance, carcass composition, nutrient retention, and hematobiochemical responses in Nile tilapia juveniles. The fish were fed with two control diets (no Cr-meth): positive control (311 g kg⁻¹ of crude protein, estimated 258 g kg⁻¹ of digestible protein) and negative control (255 g kg⁻¹ of crude protein, estimated 207 g kg⁻¹ of digestible protein). Another five experimental diets (mean 251 g kg⁻¹ of crude protein, mean estimated 204 g kg⁻¹ of digestible protein) were supplemented with 0.2, 0.4, 0.6, 0.8, and 1.0 mg Cr-meth kg diet⁻¹. Juveniles (34.31 g) were organized in a randomized design (seven treatments in triplicate) in 21 tanks (250 L) and fed until apparent satiety. The experiment lasted 9 weeks. Fish fed 0.8 and 1.0 mg Cr-meth kg diet⁻¹ showed zootechnical variables similar to the positive control. The reduced protein diets showed lower costs, and supplementation with 0.91 mg kg⁻¹ of chromium matched the profitability observed in the positive control diet. Carcass gross energy and energy retention, plasma cholesterol (total and LDL), and triglycerides values were higher in fish fed 0.6 mg Cr-meth kg diet⁻¹ than in the positive control. Treatments with dietary Cr-meth (mainly between 0.4 and 0.8 mg kg⁻¹) decreased carcass Cr, selenium, and copper retention and increased carcass nitrogen retention and muscle glycogen levels compared to the positive control. This treatment (positive control) also had lower values for total leukocytes and monocytes, respectively, than fish fed 0.2 and 0.4 mg Cr-meth kg diet⁻¹ and for eosinophils and lymphocytes than fish fed 0.8 mg Cr-meth kg diet⁻¹. In conclusion, we recommend supplementation with 0.8 mg Cr-meth kg diet⁻¹ for diets with low protein content, as it produces a dietary protein-sparing effect, reducing costs, improving immune defense, muscle glycogen, and nitrogen retention without compromising growth performance, physiology, and fish metabolism.</p></div>","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"32 7","pages":"9755 - 9777"},"PeriodicalIF":2.2,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142518475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Selection of marine macroalgae for nutrient biofilter and bioproduct trials in the coastal waters of Queensland, Australia","authors":"Emma J. Theobald,&nbsp;Andrew D. Irving,&nbsp;Angela Capper,&nbsp;Joana F. Costa,&nbsp;Guillermo Diaz-Pulido,&nbsp;Elizabeth L. Andrews,&nbsp;Jo Kelly,&nbsp;Emma L. Jackson","doi":"10.1007/s10499-024-01632-y","DOIUrl":"10.1007/s10499-024-01632-y","url":null,"abstract":"<div><p>The capacity of many macroalgae to rapidly absorb soluble inorganic nutrients and convert them into primary biomass provides opportunities for their use in the bioremediation of nutrient-enriched waters. Marine-based macroalgal cultivation has the potential to target diffuse source nutrient discharges and produce valuable bioproducts such as fertiliser, soil conditioning agents and agricultural feed additives and phycocolloids. Whilst macroalgal diversity offers benefits for improving and maintaining healthy marine ecosystems, it also presents a challenge for determining the best candidate species for cultivation as a nutrient biofilter and, ultimately, a source of bioproducts. We developed and applied a multi-criteria selection model to identify likely candidate macroalgal species for cultivation in Queensland’s coastal waters for biofiltration and bioproduct development, focusing on native species and product development for the agronomical and horticultural sectors. From a species database of 1380 macroalgal species, candidates were initially selected based on their regional abundance, distribution and morphological characteristics considered amenable to in-situ cultivation and harvesting. From a resulting shortlist of 17 species, five systematic literature searches were applied to identify biofilter potential, bioproduct potential and current cultivation status. Of the shortlisted species, <i>Ulva lactuca</i>, <i>Gracilaria edulis</i> and <i>Hypnea cervicornis</i> ranked most highly in the multi-criteria analysis, with several other species showing good potential, but requiring further investment in understanding key biological processes and the development of cultivation protocols.</p></div>","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"32 7","pages":"9631 - 9669"},"PeriodicalIF":2.2,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10499-024-01632-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142518476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploring ontogenic development and larval rearing of striped murrel (Channa striatus)","authors":"Pandi Kalaiselvan,&nbsp;Amit Ranjan,&nbsp;Mir Ishfaq Nazir,&nbsp;Eswaran Suresh","doi":"10.1007/s10499-024-01635-9","DOIUrl":"10.1007/s10499-024-01635-9","url":null,"abstract":"<div><p>The striped murrel (<i>Channa striatus</i>) is an economically valuable species in aquaculture due to its high price, medicinal properties, rapid growth, widespread consumer appeal, and ability to thrive in high-density intensive farming owing to its air-breathing capabilities. Despite these advantages, challenges in larval rearing hinder the production of high-quality fingerlings with increased survival rate. This review examines current larval rearing protocols for striped murrel, identifies bottlenecks, and explores digestive development during early stages to enhance understanding of its ontogeny. While advancements have been made, there are gaps in knowledge regarding the roles of specific genes and hormones during early development, and the impact of environmental factors on larval survival and metabolism. To address these gaps, this review draws an extensive knowledge acquired from studies on other fish species, examining digestive and metabolic genes, hormones, and environmental factors, with the goal of advancing larviculture practices for striped murrel. In addition, this review provides insights into the methodologies for studying the digestive system during early developmental stages of striped murrel larvae.</p></div>","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"32 7","pages":"9711 - 9754"},"PeriodicalIF":2.2,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142518477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The prevalence, antimicrobial susceptibility, virulence, and antimicrobial resistance genes of multidrug-resistant Vibrio parahaemolyticus recovered from Oreochromis niloticus","authors":"Abdelazeem M. Algammal,&nbsp;Mahmoud Mabrok,&nbsp;Khyreyah J. Alfifi,&nbsp;Saad Alghamdi,&nbsp;Enas A. Almanzalawi,&nbsp;Tahani M. Alqahtani,&nbsp;Mahmoud E. Elsayed,&nbsp;Hanan Elghayaty,&nbsp;Zainab Mohamed El Kattawy,&nbsp;Reham M. El-Tarabili","doi":"10.1007/s10499-024-01625-x","DOIUrl":"10.1007/s10499-024-01625-x","url":null,"abstract":"<div><p>\u0000<i>Vibrio parahaemolyticus</i> is associated with severe food-borne illness in humans as well as substantial financial setbacks in the fishing sector. To investigate the prevalence, pathogenicity, virulence, as well as the resistance patterns of <i>V. parahaemolyticus</i> retrieved from <i>Oreochromis niloticus</i>, 180 <i>O. niloticus</i> (moribund fish; <i>n</i> = 120 and apparently healthy; <i>n</i> = 60) were indiscriminately collected from Lake Manzala, Egypt. Consequently, the clinical inspection, necropsy finding, and bacteriological analysis were performed. All the retrieved isolates tested positive for the <i>gro</i>EL species-specific gene. Herein, the prevalence of <i>V. parahaemolyticus</i> in the collected fish was 8.9% (16/180), whereas the liver was the organ most prominently affected. PCR revealed that the most prevalent virulence-determinant genes associated with <i>V. parahaemolyticus</i> were the <i>tox</i>R and <i>tlh</i> genes (100% for each), then <i>tdh</i> (73.3%) and <i>trh</i> (26.7%) genes. Furthermore, 40% (18/45) of isolated <i>V. parahaemolyticus</i> were extensively drug-resistant (XDR) to seven antimicrobial classes and have <i>bla</i>_TEM, <i>bla</i>_OXA, <i>sul</i>1, <i>aad</i>A, <i>erm</i>B, and <i>tet</i>A genes. Additionally, 17.8% (8/45) of the obtained <i>V. parahaemolyticus</i> were multidrug-resistant (MDR) to three antimicrobial classes and owned <i>bla</i>_TEM, <i>erm</i>B, and <i>aad</i>A genes. The pathogenicity assay accentuated the correlation between cumulative mortality and the virulent characteristics exhibited by the inoculated strain. Definitely, 77% mortality was recorded within eight days in fish injected with a virulent <i>V. parahaemolyticus</i> strain. Briefly, this research accentuated the occurrence of XDR <i>V. parahaemolyticus</i> in fish specifying a public health concern. The emerging MDR and XDR <i>V. parahaemolyticus</i> frequently harbored <i>tox</i>R, <i>tlh</i>, and <i>tdh</i> virulence genes, and <i>bla</i>_TEM, <i>bla</i>_OXA, <i>sul</i>1, <i>aad</i>A, <i>erm</i>B, and <i>tet</i>A or <i>tet</i>B antimicrobial resistance genes.</p></div>","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"32 7","pages":"9499 - 9517"},"PeriodicalIF":2.2,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142518348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of dietary seaweed (Gracilaria pulvinata and Sargassum ilicifolium) on growth, immune and antioxidant responses, and muscle fatty acid composition of Sobaity seabream (Sparidentex hasta)","authors":"Seyed Hadi Seyedalhosseini,&nbsp;Amir Parviz Salati,&nbsp;Mansour Torfi Mozanzadeh,&nbsp;Christopher C. Parrish,&nbsp;Ali Shahriari,&nbsp;Mohammed Emam","doi":"10.1007/s10499-024-01631-z","DOIUrl":"10.1007/s10499-024-01631-z","url":null,"abstract":"<div><p>The aim of this study was to evaluate the impacts of dietary <i>Gracilaria</i> spp. and <i>Sargassum</i> spp. on growth, immunity, antioxidant status, and fatty acid composition of Sobaity seabream (<i>Sparidentex hasta</i>). A total of 540 Sobaity seabream juveniles (19.6 ± 0.5 g) were stocked into 18 tanks (300 L) and divided into six groups (three replicates per group). Fish were fed diets containing 0 (control), 3% (GS3), 6% (GS6), 9% (GS9), 12% (GS12), and 15% (GS15) <i>Gracilaria</i> and <i>Sargassum</i> mixtures in equal amounts for 8 weeks. The results showed that final weight, weight gain rate, and specific growth rate were significantly higher in fish fed GS6, GS9, and GS12 groups. Serum lysozyme, ACH50 activities, complement 4 (C4), and total Ig values were significantly increased in fish fed the 6% and 12% macroalgae mixture. The lowest liver catalase activity was found in the control, while liver superoxide dismutase (SOD) activity in the GS9 and GS12 groups was significantly higher than in the GS3 group. The highest and the lowest values of liver glutathione were observed in the GS12 and GS15 groups, respectively. Liver total antioxidant capacity content was also the highest in the GS12 group. Insulin-like growth factor-1 (<i>IGF-1</i>) relative expression level, in the liver of fish, was increased in the GS6-GS12 groups. Lysozyme relative expression level was significantly higher in the liver of fish fed macroalgae. Arachidonic acid (ARA) and eicosapentaenoic acid (EPA) were significantly higher in the GS9, GS12, and GS15 groups than in the control. Moreover, there were no significant differences in the amounts of docosahexaenoic acid (DHA), n-3 and n-6 polyunsaturated fatty acids (PUFA), long-chain PUFA, and n-3/n-6 PUFA among the experimental groups. Therefore, adding 9–12% <i>Gracilaria</i> and <i>Sargassum</i> macroalgae mixture in equal amounts to fish diets can be recommended to improve growth performance, innate immunity, liver antioxidant status, and muscle fatty acid composition in Sobaity seabream.</p></div>","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"32 7","pages":"9607 - 9629"},"PeriodicalIF":2.2,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142518985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effects of using hydrolyzed feather meal, amino acids, and probiotics in the diet of juvenile rainbow trout on growth, digestibility, and expression of growth-related genes","authors":"Ömer Metin,&nbsp;Mustafa Yildiz,&nbsp;Vahap Eldem,&nbsp;Shahram Golzar Adabi","doi":"10.1007/s10499-024-01633-x","DOIUrl":"10.1007/s10499-024-01633-x","url":null,"abstract":"<div><p>The study investigated the effect of replacing fishmeal by varying levels of hydrolyzed feather meal (HFM) as well as dietary probiotic supplementation on growth performance, digestibility, histology, and gene expression of juvenile rainbow trout (<i>Oncorhynchus mykiss</i>). Five iso-nitrogenous (average of 50.60% crude protein), iso-energetic (average of 21.79 kJ/g), and iso-lipidic (average of 21.86% crude lipid) diets were formulated and fed to triplicate groups of juvenile rainbow trout weighing 29.65 ± 0.39 g (mean ± SD) for 75 days. Dietary treatments included one control (50% fishmeal) and four experimental diets, each containing 2 g/kg probiotics (<i>Lactobacillus plantarum</i> and <i>Bacillus subtilis</i>). The experimental diets included HFM30 (150 g/kg HFM, 9 g/kg lysine, and 4 g/kg methionine), HFM35 (175 g/kg HFM, 11 g/kg lysine, and 5 g/kg methionine), HFM40 (200 g/kg HFM, 13 g/kg lysine, and 6 g/kg methionine), and HFM45 (225 g/kg HFM, 15 g/kg lysine, and 7 g/kg methionine). Up to 40% replacement of fishmeal with HFM showed no significant difference compared to control group in growth performance (<i>P</i> &gt; 0.05). Feed utilization of HFM45 was slightly lower than control and all the other experimental groups. There was no statistically significant difference in FCR value between HFM40 and control groups (<i>P</i> &gt; 0.05). The apparent digestibility coefficients (ADCs) for protein and amino acids were very high in all groups (<i>P</i> &lt; 0.05). Intestinal mucosa and sub‐mucosa layers of experimental fish showed general tissue integrity with no signs of tissue necrosis. For intestinal morphology, where 45% HFM replacement was applied, villus length to crypt depth (VL to CD) and villus surface area (SA) decreased by 46.01% and 44.44%, respectively, compared to the control group (<i>P</i> &lt; 0.05). This situation shows that intestinal morphology can be damaged when the highest level (HFM45) of feather meal is used. Dietary HFM upregulated growth-related genes such as IGF-II, IGFBP-1b, IGFr1a, GDF9, and FGF2 and downregulated GHR-I and IGF-I. Overall, inclusion of HFM at 40% showed similar results to control group in juvenile rainbow trout feeding.</p></div>","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"32 7","pages":"9671 - 9693"},"PeriodicalIF":2.2,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10499-024-01633-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142518986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The enhancement of wastewater purification efficiency in ecological floating bed aquaculture through alginate oligosaccharide treatment","authors":"Xueren Xu,&nbsp;Cong Li,&nbsp;Jun Li,&nbsp;Feng Wang,&nbsp;Sheng Zhou","doi":"10.1007/s10499-024-01627-9","DOIUrl":"10.1007/s10499-024-01627-9","url":null,"abstract":"<div><p>Algal oligosaccharides (AOS) have been shown to effectively promote plant growth. While there have been many studies on the use of AOS in promoting crop growth, few have investigated their potential in improving ecological floating bed wastewater treatment. Therefore, this paper aims to explore the effects and mechanisms of AOS in enhancing ecological floating bed wastewater treatment. Water spinach was cultivated in aquaculture wastewater treated with varying concentrations of AOS (0.025, 0.05, 0.1, and 0.2 mg/L), with an ecological floating bed without AOS serving as the control group. Results shows the addition of AOS can significantly enhancing ecological floating bed plant and microbial accumulation, resulting in profound improvement in ecological floating bed wastewater treatment efficiency. This is evident in the increased plant height, stem diameter, main root length, number of roots, leaf area, above water-surface fresh weight, below water-surface fresh weight, above water-surface dry weight, below water-surface dry weight, chlorophyll a, chlorophyll b, and chlorophyll content. The combination of 0.05 mg/L AOS with the ecological floating bed exhibits the most favorable results, with percentage increases in various indicators were 44.0%, 52.9%, 29.9%, 62.0%, 28.0%, 141.6%, 84.0%, 97.7%, 220.0%, 24.6%, 34.2%, 26.9% compared to the control group. The addition of AOS to the water spinach ecological floating bed system significantly enhances the removal efficiency of water turbidity, chemical oxygen demand (COD), ammonia nitrogen (NH₄⁺-N), nitrate nitrogen (NO₃⁻-N), total nitrogen (TN), and total phosphorus (TP) water quality indicators. This experiment also investigated the differences in microbial community structure between the control group and the group with the optimal concentration of AOS to study the mechanism of action of AOS. The combination of 0.05 mg/L AOS with the ecological floating bed demonstrates the optimal removal efficiency. This study offers crucial technical insights for further optimizing ecological floating bed technology and improving water purification efficiency.</p></div>","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"32 7","pages":"9529 - 9546"},"PeriodicalIF":2.2,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142518615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative analyses of immune gene profiles and antioxidant capabilities in the midgut and liver of three species of grass carps (Ctenopharyngodon idella) following gut infection with Aeromonas hydrophila","authors":"Wei-Sheng Luo,&nbsp;Zi-Han Xu,&nbsp;Qin-Yang He,&nbsp;Jie Peng,&nbsp;Fei Wang,&nbsp;Jian Li,&nbsp;Sheng-Wei Luo","doi":"10.1007/s10499-024-01634-w","DOIUrl":"10.1007/s10499-024-01634-w","url":null,"abstract":"<div><p><i>Aeromonas hydrophila</i> is an important etiologic agent, triggering an increased trend of disease outbreak in fish farming. In this investigation, we evaluated pathological response in the midgut and liver of three types of grass carps after gut infection. Severe pathological levels of tissue necrosis were observed in common grass carp (GC) and gynogenetic grass carp (GGC), but mild pathological symptom was detected in hybrid grass carp (DRGC), along with the dramatically increased number of goblet cells. Moreover, three types of grass carps showed upregulated levels of immune gene patterns and antioxidant abilities, whereas inflammatory cytokine expression levels in hybrid grass carp (DRGC) were lower than that of gynogenetic grass carp (GGC) and common grass carp (GC). These results suggested that DRGC may exhibit a disease tolerance against <i>A. hydrophila</i>-induced tissue inflammation.</p></div>","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"32 7","pages":"9695 - 9709"},"PeriodicalIF":2.2,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142518616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}