Aquaculture Reports最新文献

{"title":"Domestication may affect spawning performance of F1 pikeperch (Sander lucioperca) during consecutive captive reproduction","authors":"Bahram Falahatkar ,&nbsp;Iraj Efatpanah ,&nbsp;Eshagh Rasouli Kargar ,&nbsp;Mehdi Rahmati ,&nbsp;Pascal Fontaine","doi":"10.1016/j.aqrep.2024.102561","DOIUrl":"10.1016/j.aqrep.2024.102561","url":null,"abstract":"<div><div>The aim of this study was to examine the possibility of consecutive spawning of the first domesticated generation (F1) of pikeperch (<em>Sander lucioperca</em>). Fingerlings of pikeperch, produced in controlled reproduction from wild fish, were grown in captive conditions to sexual maturity for 2 years in concrete tanks. Histological observations revealed that the fish were in the peripheral nucleoli stage at 20-month old and ready to spawn at 2-year-old (129.3 ± 12.9 g) with an increase in water temperature. They were injected with 200 IU of human chorionic gonadotropin per kilogram of body weight and put in to the rectangular concrete tanks with an artificial bed for each pair to spawn. The results throughout the 4 years of propagation of domesticated pikeperch showed the readiness of fish in response to spawning induction and the nest quality (surface of the nest covered by the eggs) was fairly affected by the age of fish, while no significant changes were found in fertilization and hatching rates among different ages. In conclusion, this study demonstrated that domesticated pikeperch can be spawned at 2-year old and still capable of producing eggs for further years in captive conditions. This can help the fish farmers to distinguish the best age classes of domesticated pikeperch to achieve higher quantity and quality of controlled reproduction and offspring production.</div></div>","PeriodicalId":8103,"journal":{"name":"Aquaculture Reports","volume":"40 ","pages":"Article 102561"},"PeriodicalIF":3.2,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Overwintering temperature affects lipid and fatty acid metabolism in hepatopancreas and ovary of female mud crab Scylla paramamosain","authors":"Kaijia Yu ,&nbsp;Hanying Xu ,&nbsp;Ce Shi ,&nbsp;Chunlin Wang ,&nbsp;Changkao Mu ,&nbsp;Yangfang Ye ,&nbsp;Shujian Chen ,&nbsp;Ronghua Li ,&nbsp;Qingyang Wu","doi":"10.1016/j.aqrep.2024.102563","DOIUrl":"10.1016/j.aqrep.2024.102563","url":null,"abstract":"<div><div>The influence of four overwintering temperatures, namely 8 ℃, 12 ℃, 16 ℃, and 20 ℃, on lipid metabolism and fatty acid profile in the hepatopancreas and ovary tissues of female mud crab <em>Scylla paramamosain</em> was investigated during eight weeks. According to the results, the hepatosomatic index (HSI) of the crabs after overwintering at 16 ℃ and 20 ℃ was significantly lower than that pre-overwintering (<em>P</em> &lt; 0.05), however, overwintering did not affect the gonadosomatic index (GSI) (<em>P</em> &gt; 0.05). Moreover, the increased overwintering temperature significantly decreased the triglyceride (TG) content in the hepatopancreas (<em>P</em> &lt; 0.05), while the ovary tissue remained unaffected (<em>P</em> &gt; 0.05). Hemolymph biochemical indices demonstrated that the level of low-density lipoprotein cholesterol (LDL-C) increased markedly as temperature rose (<em>P</em> &lt; 0.05). In addition, the fatty acid profile of hepatopancreas tissue did not change significantly at different overwintering temperatures (<em>P</em> &gt; 0.05), however, the content of EPA in ovary tissue significantly increased with the temperature rise (<em>P</em> &lt; 0.05). Furthermore, the rise in temperature significantly upregulated the expressions of lipid catabolism genes (<em>hsl</em>, <em>cpt Ⅰ</em>) and lipid transport genes (<em>fabp3</em>, <em>fatp4</em>), while significantly downregula<em>t</em>ed the expressions of lipid synthesis genes (<em>acc</em>, <em>g6pd</em>) in the hepatopancreas. Meanwhile, the temperature did not affect the expressions of lipid synthesis genes (<em>acc</em>, <em>fas</em>, <em>g6pd</em>) and lipid catabolism genes (<em>hsl</em>, <em>aco</em>, <em>cpt Ⅰ</em>, <em>cpt Ⅱ</em>) in ovary tissue. Still, the temperature increase significantly upregulated the expressions of PUFA synthesis genes (<em>Δ6fad</em>, <em>elovl4</em>). In conclusion, overwintering at 16 ℃ and 20 ℃ promoted the process of lipid catabolism and transport in hepatopancreas tissue of mud crabs. However, overwintering at 20 ℃ was beneficial for accumulating more EPA in ovary tissue from a breeding perspective.</div></div>","PeriodicalId":8103,"journal":{"name":"Aquaculture Reports","volume":"40 ","pages":"Article 102563"},"PeriodicalIF":3.2,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Influence of temperature on growth and oxidative status of juvenile Southern black drum (Pogonias courbina)","authors":"Felipe Kuroski ,&nbsp;Lucas C. Maltez ,&nbsp;Olivia Menossi ,&nbsp;Thiago P.A.P. Oliveira ,&nbsp;Brandon J.Q. Gamboa ,&nbsp;Marcelo H. Okamoto ,&nbsp;Ricardo V. Rodrigues ,&nbsp;Luis A. Sampaio","doi":"10.1016/j.aqrep.2024.102560","DOIUrl":"10.1016/j.aqrep.2024.102560","url":null,"abstract":"<div><div>Temperature has a strong influence on fish metabolism, therefore it impacts aquaculture production. This study aims to understand its effects on survival, growth, and oxidative stress responses of Southern black drum <em>Pogonias courbina</em>. Therefore, 450 juvenile fish (weight 0.58 ± 0.19 g) were exposed in triplicate to 23, 26, and 29°C for 25 days. Fifty fish were stocked in circular tanks (300 L) connected to recirculating aquaculture systems with temperature control. Fish were fed four times a day. Temperature did not affect fish survival, which was above 98 % in all treatments. Growth was significantly improved in higher temperatures. The final weight at 29°C was 2.9-fold higher than those fish kept at 23°C. The same pattern was found in the specific growth rate, which was higher at 29°C than at the other temperatures evaluated. Fish reared at 26 and 29°C also had higher total feed intake and better apparent feed conversion. Lipid peroxidation was higher in muscle, gill, and liver of fish kept at the lowest temperature (23°C). In addition, this temperature also triggered upper regulation of the total antioxidant capacity in gill and liver, compared to 29 °C. Protein thiol levels in fish liver were higher at 29°C than at 23°C. The best performance of fish kept at 29°C may be related to the increased total feed intake coupled with better apparent feed conversion, along with lower lipid and protein damage, plus lower investment in antioxidant capacity. Based on the present results, we concluded that among the tested temperatures, 29°C is the best temperature for production of juvenile <em>P. courbina</em>.</div></div>","PeriodicalId":8103,"journal":{"name":"Aquaculture Reports","volume":"40 ","pages":"Article 102560"},"PeriodicalIF":3.2,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Molecular identification of chitinase and its function in growth of Odontobutis potamophila","authors":"Siyu Lu ,&nbsp;Lin Du ,&nbsp;Ting Zhang ,&nbsp;Dan Wang ,&nbsp;Jinjuan Wan ,&nbsp;Guoxing Liu ,&nbsp;Yuning Hu ,&nbsp;Yu Xu ,&nbsp;Zhiqiang Xu ,&nbsp;Xuguang Li","doi":"10.1016/j.aqrep.2024.102555","DOIUrl":"10.1016/j.aqrep.2024.102555","url":null,"abstract":"<div><div>Chitinases are pivotal enzymes for the degradation of chitin, which play a role in food digestion. However, the functional roles of chitinases in teleosts remain under-explored. In this study, a full-length cDNA of chitinase gene (namely, <em>OpCht</em>) was obtained from dark sleeper <em>Odontobutis potamophila</em>. The predicted amino acid sequence of <em>OpCht</em> consisted of a typical catalytic domain and a chitin-binding domain interconnected with a linker region. Phylogenetic analyses suggest that <em>OpCht</em> has appeared in the teleost-specific monophyletic branches (CHIO). Quantitative real-time PCR analyses showed that <em>OpCht</em> was mainly expressed in stomach, liver, intestine and increased significantly during the period of juvenile. The optimal gradient concentrations and intervals/efficiency of RNA interference (RNAi) in <em>OpCht</em> were established, the results demonstrated that RNAi significantly repressed the expression of <em>OpCht</em> and diminished the chitinase activity. After 8 weeks of long-term RNAi, knockdown of <em>OpCht</em> reduced the height of intestinal villus and the thickness of muscular layer, which led to a decline in weight gain rate (WGR), while the accompanying intestinal inflammation contributed to a decreased survival rate (SR) in <em>O. potamophila</em>. In conclusion, <em>OpCht</em> is implicated in chitin degradation and plays an important role in intestinal health and growth performance in <em>O. potamophila</em>.</div></div>","PeriodicalId":8103,"journal":{"name":"Aquaculture Reports","volume":"40 ","pages":"Article 102555"},"PeriodicalIF":3.2,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Effect of opercular deformity on morphological and transcriptomic profiling of gills in golden pompano (Trachinotus ovatus)","authors":"Yuwei Wu ,&nbsp;Qian Ma ,&nbsp;Dihao Huang ,&nbsp;Liuyong Wang ,&nbsp;Qiling Zhou ,&nbsp;Chunli Ran ,&nbsp;Gang Chen","doi":"10.1016/j.aqrep.2024.102545","DOIUrl":"10.1016/j.aqrep.2024.102545","url":null,"abstract":"<div><div>The golden pompano (<em>Trachinotus ovatus</em>), one of China's most important economic fishes in marine culture, is highly susceptible to external environmental changes during early development. Skeletal deformities in the opercular complex, jaws, and vertebral column are the most common consequences. The opercular deformity can result in the exposure of the gill chamber, which may lead to adverse effects on the gill function. In this study, gill samples were collected from both sides of the unilaterally deformed golden pompano to elucidate the effect of opercular deformity on morphological characteristics and gene expression of the gills. Paraffin section, Hematoxylin-Eosin (HE) staining, and TdT-mediated dUTP nick-end labeling (TUNEL) of the gills revealed that no significant difference in morphological structure or apoptosis was identified between the gills collected from the deformed and normal sides. Transcriptome sequencing of the gill samples has detected a total of 100 differentially expressed genes (DEGs), including 66 up-regulated and 34 down-regulated genes. GO functional enrichment analysis revealed that the DEGs were significantly enriched in responses to stimulus, localization, and metal ion binding. KEGG pathway enrichment analysis of the DEGs indicated notable enrichment in pathways related to immune response and inflammation, including <em>Staphylococcus aureus</em> infection, leukocyte transendothelial migration, tight junction, and cell adhesion molecules pathways. These enrichment analysis results suggest that functions associated with immunity and disease, ion homeostasis, energy metabolism, and apoptosis may be influenced by the opercular deformity.</div></div>","PeriodicalId":8103,"journal":{"name":"Aquaculture Reports","volume":"40 ","pages":"Article 102545"},"PeriodicalIF":3.2,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Optimisation of controlled reproduction protocol in broadhead catfish (Clarias macrocephalus Günther, 1864) using Ovopel™: Effect of different hormonal treatment methods on reproductive traits","authors":"Nguyễn Ngọc Quyến ,&nbsp;Nguyễn Thanh Tâm ,&nbsp;Thạch Anh Pha ,&nbsp;Lý Anh Thuật ,&nbsp;Nguyễn Ngọc Lợi ,&nbsp;Nguyễn Thị Trúc Quyên ,&nbsp;László Horváth ,&nbsp;Tamás Müller","doi":"10.1016/j.aqrep.2024.102551","DOIUrl":"10.1016/j.aqrep.2024.102551","url":null,"abstract":"<div><div>This study aims to establish novel protocols for hormonal delivery methods and dosages of Ovopel™ (D-Ala⁶, Pro⁹ NEt-mGnRH plus metoclopramide) for spawning induction of female broadhead catfish (<em>Clarias macrocephalus</em>) in control conditions. A total of 84 female breeders (238.63 ± 46.98 g) were placed equally into 12 treatments, 7 fish per treatment. The specimens were managed as intramuscular injection (IM), intraperitoneal injection (IP), or ovarian lavage injection (OI). Hormonal induction of ovulation was carried out as follows: three hormonal delivery methods (IM, IP, or OI) in combination with three doses of Ovopel™ (0.5, 1, or 1.5 pellet kg ^{̶ 1} BW), respectively; the nine treated groups were defined as IM-0.5, IM-1, IM-1.5, IP-0.5, IP-1, IP-1.5, OI-0.5, OI-1, and OI-1.5, respectively. The present results reported that no fish ovulated in the control groups (0.9 % NaCl solution treatments; C-IM, C-IP, and C-OI). In hormone-induced groups, 71.43–100 % of fish ovulated, but no differences were observed in ovulation rates (<em>P</em> &gt; 0.05). The mean latency periods (LT, hours: minutes) indicated significant differences among treated groups (<em>P</em> &lt; 0.05); there was the shortest time in treatment OI-1.5 (7:19 ± 1:04, hours: minutes) and IP-1.5 (7:58 ± 1:01, hours: minutes). The values viz. pseudo-gonadosomatic index (PGSI, %), fertilisation rate (FR, %), hatching rate (HR, %), and survival rate (SR, %) showed considerable individual changes among treatments; nevertheless, there was no statistically significant difference between these average parameters of treated batches (<em>P</em> &gt; 0.05). Taking into account hormone doses (economical consideration) as well as invasive and less-invasive hormone administration, the 0.5-pellet Ovopel™ ovarian lavage treatment is recommended for artificial propagation of <em>C. macrocephalus</em>.</div></div>","PeriodicalId":8103,"journal":{"name":"Aquaculture Reports","volume":"40 ","pages":"Article 102551"},"PeriodicalIF":3.2,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Adaptability of clams to prolonged heatwaves: Influences on gene expression, antioxidant capacity, and histology of Chinese cyclina Cyclina sinensis","authors":"Meimei Liu ,&nbsp;Zhichao Wang ,&nbsp;Hongwei Ni ,&nbsp;Wenqing Zhuo ,&nbsp;Gaoyuan Yuan ,&nbsp;Zhiguo Dong","doi":"10.1016/j.aqrep.2024.102559","DOIUrl":"10.1016/j.aqrep.2024.102559","url":null,"abstract":"<div><div>An increase in the duration of marine heat waves (MHWs) has a serious negative impact on the survival of marine organisms. However, the impact of MHWs on <em>Cyclina sinensis</em> remains largely unknown. Here, this study assessed the effects of acute (25°C or 35°C for 12 h) and prolonged heatwave stress (no heatwave (25°C for 4 weeks), short heatwave (25°C for 3 weeks then 1 week at 35°C), and long heatwave (35°C for 4 weeks)) on the physiology and metabolism of <em>C. sinensis.</em> Acute heat stress alters the expression of immune-related genes in the hepatopancreas, including <em>LSZ1</em>, <em>DPP1</em>, <em>SRB1</em>, <em>Casp3</em>, <em>BIRC2</em>, <em>Arf</em>, <em>CLEC4M</em>, <em>CLEC10A</em> and <em>Gadd45β</em>. The transcript levels of chaperones genes and antioxidant enzymes were up-regulated after acute heat stress treatment (35℃). Under prolonged heatwave stress challenge, <em>HSP27</em>, <em>HSP70B2</em> and <em>HSP90β</em> mRNA in hepatopancreas and mantle were up-regulated in short heatwave group. The mRNA levels or activities of SOD in the hemolymph, hepatopancreas, and gills, as well as CAT in the hemolymph, hepatopancreas, and gills, were higher in clams from the short heatwave group than those from the no heatwave group. Surprisingly, the mRNA levels and activities of SOD or <em>GSTP1</em> in the gills of clams in the short and long heatwave groups were significantly lower than those in the control group. The levels of GSH in the hepatopancreas and gills of clams in the short and long heatwave groups were lower than those in the no heatwave group, but the level of MDA was higher than that in the no heatwave group. Moreover, prolonged exposure to heatwaves resulted in the breakage and shortening of gill filaments and thinning of the hepatopancreas wall in clams. These findings suggest that heatwave cause oxidative stress and induce tissue damage in mollusks.</div></div>","PeriodicalId":8103,"journal":{"name":"Aquaculture Reports","volume":"40 ","pages":"Article 102559"},"PeriodicalIF":3.2,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Variability of Kappaphycus alvarezii cultivation in South-Sulawesi (Indonesia) related to the monsoon shift: Water quality, growth and colour quantification","authors":"Laurent Barillé ,&nbsp;Iona L.R. Paterson ,&nbsp;Simon Oiry ,&nbsp;Agus Aris ,&nbsp;Elizabeth J. Cook-Cottier ,&nbsp;Nurjannah Nurdin","doi":"10.1016/j.aqrep.2024.102557","DOIUrl":"10.1016/j.aqrep.2024.102557","url":null,"abstract":"<div><div><em>Kappaphycus alvarezii</em> is a red eucheumatoid seaweed of high global economic significance due to its carrageenan content. Nevertheless, notable unexplained fluctuations in growth and production persist, exacerbated by limited data availability, while spatial and temporal factors remain unclear. This research aimed to characterise the variability of water quality, growth and thallus colouration of a green morphotype of <em>K. alvarezii</em> related to the monsoon shift in South Sulawesi, Indonesia. The experiment was conducted from July to November over contrasting dry and wet seasons. Three cultivation cycles of <em>ca</em>. 40 days were monitored: Cycle 1 (July/August), Cycle 2 (August/October), and Cycle 3 (October/November). The Southeast monsoon season (Cycles 1 and 2) was characterised by higher salinities, but lower temperatures and nutrients. During the wet Northwest monsoon season (Cycle 3), the water was hotter, with higher concentrations of nitrates and phosphates, but lower salinities. The highest growth rate at harvest of 5.0 %.day⁻¹ was observed during Cycle 3. Fresh biomass production per m of the cultivation line was significantly higher for Cycle 3, 827.78 ± SD 101.50 g.m⁻¹ compared to Cycle 1 and 2, respectively 484.38 ± SD 11.27 g.m⁻¹ and 510 ± SD 25.69 g.m⁻¹. The higher growth during the West monsoon was likely due to the increase in nutrient concentrations brought by freshwater runoff, which coincided with higher rainfall. The spectral signature of the green morphotype was very similar to green macrophyte spectra with higher reflectance in the 500–600 m wavelength region. A decrease in the greenness optical index at 550 nm was observed at the end of each cultivation cycle, with the thalli appearing darker. This study showed marked variations in growth rates, with significantly higher growth during the wet West monsoon, in conjunction with a higher risk of production loss due to the prevalence of ice-ice disease.</div></div>","PeriodicalId":8103,"journal":{"name":"Aquaculture Reports","volume":"40 ","pages":"Article 102557"},"PeriodicalIF":3.2,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Comprehensive profiling of gut bacterial communities in hybrid red tilapia with and without streptococcosis","authors":"Pathamawan Amthungphong ,&nbsp;Natthaphong Sombuttra ,&nbsp;Triwit Rattanarojpong ,&nbsp;Kanthida Kusonmano ,&nbsp;Saengchan Senapin ,&nbsp;Satid Chatchaiphan ,&nbsp;Watanalai Panbangred ,&nbsp;Jirayut Euanorasetr","doi":"10.1016/j.aqrep.2024.102556","DOIUrl":"10.1016/j.aqrep.2024.102556","url":null,"abstract":"<div><div>The gut microbiome is crucial in regulating nutrient metabolism, immune responses, and defense mechanisms against diseases. This study aimed to comprehensively compare bacterial community profiles within the foregut, midgut, and hindgut regions of red tilapia fish with and without streptococcosis. Red tilapia (<em>Oreochromis niloticus</em> × <em>Oreochromis mossambicus</em>) with and without streptococcosis were collected from a river cage culture farm in Central Thailand. The infected streptococcal isolates were confirmed by 16S rRNA sequencing. The 16S amplicon was sequenced in gut microbiome samples from healthy and diseased groups to analyze the bacterial composition profiles associated with red tilapia with and without streptococcosis. The alpha diversity of bacterial communities in the gut microbiome was significantly higher in the healthy group than in the diseased group. Beta diversity indicated distinct differences in bacterial communities between groups. Taxonomical profiling revealed Proteobacteria followed by Fusobacteria as the dominant phyla and <em>Cetobacterium</em> as the dominant genus in the gut of both groups. Linear discriminant analysis effect size indicated <em>Vibrio</em>, <em>Plesiomonas</em>, <em>Aeromonas</em>, <em>Streptococcus</em>, <em>Chitinibacter</em>, and <em>Edwardsiella</em> as relatively more abundant in the diseased group. These groups could serve as baseline populations associated with streptococcosis in red tilapia. In contrast, <em>Romboutsia, Clostridium sensu stricto</em> 1<em>, Turicibacter, Epulopiscium, Bacillus, Streptomyces, Hyphomicrobium</em>, and <em>Nocardioides</em> were more abundant in the healthy group. This study provides insights into the bacterial community profiles associated with streptococcosis in the gut of red tilapia. It enhances our understanding of gut bacterial communities in red tilapia and offers a baseline perspective on bacterial populations associated with streptococcosis, which could benefit future treatment and diagnostic strategies.</div></div>","PeriodicalId":8103,"journal":{"name":"Aquaculture Reports","volume":"40 ","pages":"Article 102556"},"PeriodicalIF":3.2,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Effects of laminarin on antioxidant capacity and non-specific immunity of spotted sea bass (Lateolabrax maculatus)","authors":"Sishun Zhou ,&nbsp;Huihui Qin ,&nbsp;Zhongying Long ,&nbsp;Lumin Kong ,&nbsp;Jianrong Ma ,&nbsp;Yi Lin ,&nbsp;Hao Lin ,&nbsp;Zhangfan Huang ,&nbsp;Zhongbao Li","doi":"10.1016/j.aqrep.2024.102549","DOIUrl":"10.1016/j.aqrep.2024.102549","url":null,"abstract":"<div><div>As a prebiotic, laminarin has functions such as antioxidant and improving the body's immunity. This study explores the antioxidant capacity and nonspecific immune effects of laminarin by adding different concentration gradients (0 %, 0.4 %, 0.8 %, 1.2 %, 1.6 %, and 2 %) to the diet of spotted sea bass, <em>Lateolabrax maculatus</em>. 450 spotted sea bass (initial weight: 7.14 ± 0.10 g) were randomly divided into 6 groups, each group was repeated 3 times, 25 fish per experimental tank, and fed with different concentrations of laminarin. After 56 days of feeding, samples were collected and measured for antioxidant capacity and non-specific immune indicators. The results show that, in terms of antioxidant capacity, the dietary addition of 0.8 % laminarin significantly increased the serum total antioxidant capacity, glutathione content, and superoxide dismutase activity in spotted sea bass (<em>P</em> &lt; 0.05). In addition, 0.4–0.8 % laminarin supplementation significantly increased the total antioxidant capacity and catalase activity and decreased the malondialdehyde content in the spleen of the spotted sea bass (<em>P</em> &lt; 0.05). Dietary addition of 0.8–1.2 % laminarin significantly increased glutathione content in head kidney (<em>P</em> &lt; 0.05). In terms of immunity, the addition of 0.8 % laminarin to the diet significantly increased serum acid phosphatase, serum lysozyme, spleen lysozyme, and head kidney acid phosphatase activities in spotted sea bass (<em>P</em> &lt; 0.05). The addition of 0.4–0.8 % laminarin to the diet significantly increased serum immunoglobulin M, head kidney lysozyme activity (<em>P</em> &lt; 0.05). Diet supplemented with 0.8 % laminarin induced 739 differential genes in head kidney. The differentially expressed genes in head kidney were significantly enriched in immune-related pathways. In conclusion, dietary 0.8 % laminarin supplementation can promote the antioxidant capacity and non-specific immunity of juvenile spotted sea bass.</div></div>","PeriodicalId":8103,"journal":{"name":"Aquaculture Reports","volume":"40 ","pages":"Article 102549"},"PeriodicalIF":3.2,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}