Aquaculture International最新文献

{"title":"Effects of alanine supplementation on the growth, biochemical composition and appetite of ivory shell (Babylonia areolata)","authors":"Xin Hong,&nbsp;Yunchao Sun,&nbsp;Jingcan Liu,&nbsp;Feng Yu,&nbsp;Yi Yang,&nbsp;Chunsheng Liu","doi":"10.1007/s10499-025-01998-7","DOIUrl":"10.1007/s10499-025-01998-7","url":null,"abstract":"<div><p>Alanine has been shown to significantly promote feeding behavior in aquatic animals, particularly fish. Our preliminary experiment showed that dietary supplementation with alanine notably enhanced the appetite of ivory shells; therefore, we inferred that alanine could be used as feed attractant in artificial diets of ivory shells. This study conducted an 8-week feeding trial to investigate the effects of various levels of alanine supplementation (0.0% as the control group, 2.0, 2.5, 3.0, 3.5, and 4.0%) on the growth performance, body biochemical composition, and appetite in juvenile ivory shell. The results indicated that alanine supplementation significantly improved the specific growth rates (<i>SGR</i>s) and total feed intake (<i>TFI</i>) of the ivory shells, with statistically significant differences observed (<i>P</i> &lt; 0.05). As the alanine supplementation increased, <i>SGR</i>s rose markedly, peaking in the group fed a 3.5% alanine-supplemented diet (2.56%/day). At this supplementation level, <i>TFI</i> reached 7.31 g, and the feed conversion ratio (<i>FCR</i>) decreased to its lowest value of 1.32. Alanine supplementation did not alter intestinal pepsin activity but significantly increased pepsin activity in the hepatopancreas of groups supplemented with 2.5–4.0% alanine. Additionally, alanine supplementation led to a marked elevation in lipase activities in both the intestines and hepatopancreas. Specifically, significantly higher lipase activities were observed in the intestines of groups supplemented with 2.5–3.5% alanine and in the hepatopancreas of groups supplemented with 2.0–3.5% alanine. Alanine supplementation also affected the expression of four appetite-related genes in the hepatopancreas, in which <i>Orexin</i> and <i>NPY</i> showed an initial increase followed by a decrease, while <i>Leptin</i> and <i>Cholecystokinin</i> exhibited a downward trend followed by an increase as alanine supplementation levels increased. The ivory shells fed alanine-supplemented diets showed a significant increase in the crude protein and glycogen content in their muscles compared to the control group, and the content of seven amino acids in the muscles of the groups supplemented with 3.0–3.5% alanine also increased significantly (<i>P</i> &lt; 0.05). The lipid content did not differ significantly between the control group and the alanine-supplemented diet groups, with the exception of the 4.0% group. In contrast, the profile of PUFA in the alanine-supplemented diet groups showed a significant decrease compared to the control group (<i>P</i> &lt; 0.05). In conclusion, appropriate alanine supplementation levels (3.0–3.5%) have beneficial effects on the cultivation of ivory shells.</p></div>","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"33 5","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143913945","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":"Natural fresh feed for successful production of G1 hybrid of mud crabs Scylla tranquebarica (Fabricius, 1798) and Scylla olivacea (Herbst, 1796)","authors":"Gunarto Gunarto,&nbsp;Muliani Muliani,&nbsp;Bunga Rante Tampangallo,&nbsp;Sulaeman Sulaeman,&nbsp;Yustian Rovi Alfiansah,&nbsp;Herlinah Herlinah,&nbsp;Muhammad Yusri Karim","doi":"10.1007/s10499-025-02000-0","DOIUrl":"10.1007/s10499-025-02000-0","url":null,"abstract":"<div><p>Natural fresh feed influences the growth and reproduction of female mud crabs. We conduct a set of feeding experiments using natural fresh feed. Twenty subadult female <i>Scylla tranquebarica</i> were individually reared in a plastic bucket with a recirculation system. The first group, consisting of 10 crabs, was fed with low-value fish <i>Leiognathus equula</i> (A), and the second group, with a similar number of crabs, was fed with a combination of <i>L. equula</i> and oyster <i>Crassostrea irredalei</i> (B). The feeding rate was administered twice daily at 5–10% of the total biomass. The moulting of females was observed daily. Upon moulting, growth was recorded, and the individual can mate with adult males of <i>Scylla olivacea</i>. The new mate females were reared until they matured their gonads, spawned, and produced hybrid G1 larvae. Larvae were reared until they reached the crablet stage. The crablet G1 hybrid growth in the brackish water pond was controlled with crablet non-hybrid from the hatchery. We found that the sub-adult female crab <i>S. tranquebarica</i> receiving treatment B had faster growth, indicated by earlier moulting, mating, and spawning periods, followed by larval production, compared to those treated with diet A (<i>p</i> &lt; 0.05). Thus, treatment B allowed faster production of the G1 hybrid than treatment A. Those G1 hybrid larvae from the broodstock fed with treatment B grow faster than those of larvae obtained from the hatchery (control), as reflected in the higher larva development index (LDI) value.</p></div>","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"33 5","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908679","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 antifungal efficacy of Satureja bachtiarica and Achillea talagonica against Saprolegnia parasitica infection in rainbow trout (Oncorhynchus mykiss)","authors":"Saied Habibian Dehkordi,&nbsp;Shafigh Shafiei,&nbsp;Abbas Mokhtari,&nbsp;Somayeh Shahrookh","doi":"10.1007/s10499-025-02015-7","DOIUrl":"10.1007/s10499-025-02015-7","url":null,"abstract":"<div><p>The rising prevalence of fungal infections in aquaculture, coupled with the environmental and health risks posed by chemical antifungal agents, highlights the need for sustainable alternatives. This study investigates the antifungal efficacy of ethanolic extracts from <i>Satureja bachtiarica</i> and <i>Achillea talagonica</i> against <i>Saprolegnia parasitica</i> isolated from rainbow trout (<i>Oncorhynchus mykiss</i>) eggs. The primary phenolic compounds in the extracts were identified and quantified using high-performance liquid chromatography (HPLC). In vitro assays were conducted to determine the minimum inhibitory concentration (MIC) and minimum fungicidal concentration (MFC) of each extract. Subsequent in vivo experiments assessed the efficacy of the extracts in preventing fungal infection and transmission in fertilized trout eggs. Chemical analysis revealed that <i>S. bachtiarica</i> extract contained 270 mg/100 g of rosmarinic acid, while <i>A. talagonica</i> extract contained 680 mg/100 g of chlorogenic acid. The MIC and MFC of <i>S. bachtiarica</i> extract were 31.2 µL/mL and 62.5 µL/mL, respectively; those of <i>A. talagonica</i> extract were 62.5 µL/mL and 125 µL/mL. In vivo results demonstrated that <i>S. bachtiarica</i> extract significantly reduced fungal transmission from infected to healthy eggs and inhibited <i>S. parasitica</i> colonization in fertilized eggs, outperforming the chemical antifungal agent formalin. In contrast, <i>A. talagonica</i> extract exhibited antifungal effects only in vitro and showed no significant efficacy in vivo. These findings support the potential application of <i>S. bachtiarica</i> extract as a natural and environmentally friendly alternative for controlling fungal infections in aquaculture. Further research is warranted to optimize dosage regimens and evaluate the long-term impacts on fish health and aquatic ecosystems.</p></div>","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"33 5","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908876","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 importance of copepods for growth and pigmentation of the Brazilian basslet Gramma brasiliensis larvae","authors":"Sérgio Leandro Araújo-Silva,&nbsp;Vanessa Martins da Rocha,&nbsp;Ksenia Skorupa,&nbsp;Caio Magnotti,&nbsp;Gabriel Dutra Rodrigues,&nbsp;Jonathas Rodrigo dos Santos Pinto,&nbsp;Helen Rayane Lopes Moraes,&nbsp;Mônica Yumi Tsuzuki","doi":"10.1007/s10499-025-02017-5","DOIUrl":"10.1007/s10499-025-02017-5","url":null,"abstract":"<p><i>Gramma brasiliensis</i> is a marine ornamental fish popular in the aquarium trade. Developing a reproductive protocol for this species in captivity is an important conservation tool. In this study, we compared the survival, growth, and pigmentation rates of larvae fed different densities of the copepod <i>Parvocalanus crassirostris</i> and the rotifer <i>Brachionus rotundiformis</i> in the first 10 days. The treatments were: Control—(10 rotifers mL⁻¹); Treatment 1 (T1)—(9.5 rotifer mL⁻¹) + (0.5 copepod mL⁻¹); (T2)—(9 rotifers mL⁻¹) + (1 copepod mL⁻¹) and (T3)—(8 rotifers mL⁻¹) + (2 copepods mL⁻¹). Two larvae from each experimental unit were removed on days 1, 3, 5, 7 and 10 and photographed with a magnifying glass for standard length (SL), body height (BH), body width (BW), mouth width (MW) measurements and pigmentation assessment. There was no significant difference between treatments in survival (17 ± 7.2%; mean + SD) (p &gt; 0.05). The use of 2 copepods ml⁻¹ in co-feeding with rotifers yielded the best results, leading to earlier notochord flexion, increased growth, and improved pigmentation compared to using only rotifers in a 10-day larviculture of <i>G. brasiliensis</i>. Even at lower densities (0.5 and 1.0 copepod ml⁻¹), adding copepods to the diet enhanced growth on days 3 and 5, anticipated notochord flexion, and improved pigmentation of the larvae compared to the control group.</p>","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"33 5","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908875","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":"Microbe-driven farming system enhances production, water consumption efficiency, and economic returns in a sustainable high-density nursery rearing of Labeo rohita (Hamilton, 1822)","authors":"Himanshu Sekhar Swain,&nbsp;Husne Banu,&nbsp;Vignesh Velmani,&nbsp;Pratap Chandra Das","doi":"10.1007/s10499-025-02004-w","DOIUrl":"10.1007/s10499-025-02004-w","url":null,"abstract":"<div><p>In the present study, spawn of rohu, <i>Labeo rohita</i>, of size 5.6 ± 0.15 mm (2.40 ± 0.06 mg) were stocked at four densities, i.e., 4000 spawns m⁻³ (T1), 6,000 m⁻³ (T2), 8 000 m⁻³ (T3), and 10,000 m⁻³ (T4) to evaluate the suitable density for the microbe-mediated biofloc system. Rohu spawn was reared in 20,000L poly-lined circular biofloc tanks (5 m diameter) in triplicates for 28 days. The spawn was fed with dust feed (36% CP, 4% fat) at 4 kg per one million of seeds in two split meals with a 10% daily increment. The floc was prepared with the use of molasses, and a C/N ratio of 12:1 was maintained, which enabled maintenance of floc volume at 8–10 ml⁻¹/L. High fry survivals of 79.7–86.8% were achieved and plotted an inverse relation with rearing densities from T4 to T1, and T1 was significantly different from other treatments (<i>P</i> &lt; 0.05). The fry length after 28 days of rearing were 20.13 ± 1.7, 17.8 ± 1.6, 15.6 ± 1.5, and 13.0 ± 1.3 mm, and weights were 90.97 ± 5.52 mg, 74.10 ± 4.85 mg, 67.17 ± 2.62 mg, and 41.07 ± 2.99 mg in T1, T2, T3, and T4, respectively. While the fry growth, particularly in T1, T2, and T3, is comparable to those observed in rohu in concrete tanks (17–21 mm, 55–62% survival after 21 days). Higher survival was achieved, even at 2–4 folds higher densities in the biofloc system. However, the total length was relatively low and demanding an extension of the rearing period in T4 at fivefolds higher density despite the higher survival rate. The water consumption showed an inverse relation with rearing density, and accordingly, the water productivity increased with increased densities from T1 to T4. The level of stress biomarkers, like Superoxide Dismutase (SOD), Catalase, Glucose, and Alkaline Phosphatase (ALP) was significantly higher in T4 in comparison to other treatments. The calculated net profit and cost–benefit ratio were significantly highest in T3 (135.37 ± 8.63 USD) and significantly lowest in T1 (82.5 ± 5.92 USD) whereas T2 (109.7 ± 17.03 USD) and T4 (115.33 ± 8.11 USD) were statistically homogenous. Therefore, the study recommended a rearing density of rohu spawn in the biofloc of up to 8000 m⁻³.</p></div>","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"33 5","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908729","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":"Impact of early and late maturation on the reproductive performance broodstocks of Russian sturgeon (Acipenser gueldenstaedtii)","authors":"Gokhan Tuncelli,&nbsp;Momin Momin,&nbsp;Devrim Memis","doi":"10.1007/s10499-025-02016-6","DOIUrl":"10.1007/s10499-025-02016-6","url":null,"abstract":"<div><p>This study investigates the reproductive viability of Russian sturgeon (<i>Acipenser gueldenstaedtii</i>) in aquaculture settings, focusing on the impact of maturation timing on breeding success and reproductive performance. Hormone-induced spawning was employed, and gamete quality was evaluated to compare two distinct maturation groups: Early-Maturing (EM, 10 + years) and Late-Maturing (LM, 20 + years). Both groups received identical hormone doses for induced spawning. However, the LM group demonstrated significantly lower spawning capability, achieving only 50.24% fertilization success compared to 85.09% in the EM group. Similarly, the hatching rate in the LM group averaged 40.4%, while the EM group achieved a markedly higher rate of 78.55%. Gamete quality also varied between the groups. The LM group exhibited larger egg diameters (3.58 mm) but lower relative fecundity/kg BW (950 eggs/kg), whereas the EM group had smaller egg diameters (2.97 mm) but significantly higher relative fecundity/kg BW (1210 eggs/kg). This study highlights the importance of considering maturation timing in sturgeon breeding and underscores the need for further research to fully understand the reproductive dynamics associated with maturation timing. Thus, broodstock management will contribute to farms producing more efficiently and economically.</p></div>","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"33 5","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10499-025-02016-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908730","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":"Growth performance, blood biochemistry, gene expression, gonad histology, and sexual parameters in common carp (Cyprinus carpio) fed diets supplemented with Tribulus terrestris extract","authors":"Hamidreza Ahmadniaye Motlagh,&nbsp;Mahdi Banaee,&nbsp;Davar Shahsavani,&nbsp;Hossein Nourani,&nbsp;Ali Javadmanesh,&nbsp;Mehrdad Sarkheil","doi":"10.1007/s10499-025-02006-8","DOIUrl":"10.1007/s10499-025-02006-8","url":null,"abstract":"<div><p>This study investigated the effects of dietary <i>Tribulus terrestris</i> extract (0, 100, 1000, or 2000 mg/kg) on growth, health, and reproductive physiology in common carp (<i>Cyprinus carpio</i>). Over 60 days, fish fed 100 and 1000 mg/kg exhibited higher survival rates (<i>P</i> &lt; 0.05), though growth metrics (final weight, FCR, SGR) remained unchanged (<i>P</i> &gt; 0.05). Reproductive indices displayed sex-specific responses: males showed elevated gonadosomatic index (GSI) at 100–1000 mg/kg, while females had increased GSI at 2000 mg/kg (<i>P</i> &lt; 0.05). <i>T. terrestris</i> extract at 1000 mg/kg significantly reduced female GSI (<i>P</i> &lt; 0.05), while no dose increased male testosterone, suggesting species- and sex-specific efficacy. Blood biochemistry revealed dose-dependent effects, including elevated triglycerides (males, 2000 mg/kg; females, 1000–2000 mg/kg), cholesterol peaking at 100 mg/kg (both sexes), and reduced globulin levels (<i>P</i> &lt; 0.05). Liver function markers SGOT and SGPT increased at higher doses (<i>P</i> &lt; 0.05), while alkaline phosphatase (ALP) decreased at 1000–2000 mg/kg, and lactate dehydrogenase (LDH) declined in males at 1000 mg/kg. Gene expression analysis highlighted significant upregulation of ovarian NRF2 (linked to oxidative stress response), whereas GDF9 (critical for folliculogenesis) remained unaffected. Histologically, <i>T. terrestris</i> enhanced spermatogenic maturity (increased spermatocytes/spermatozoa) and delayed ovarian development in females at 1000 mg/kg, correlating with reduced estradiol (<i>P</i> &lt; 0.05). These findings underscore <i>T. terrestris</i> as a multifunctional supplement for modulating male reproductive performance and female sexual maturation in aquaculture, with implications for broodstock management.</p></div>","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"33 5","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908680","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":"Compensatory growth and physiological responses of matrinxã (Brycon amazonicus) under cyclic feed restriction","authors":"Márcia Simões dos Santos,&nbsp;Ariany Rabello da Silva Liebl,&nbsp;Ellan Rodrigo Monteiro Paes Fernandes,&nbsp;Christiane Patricia Feitosa de Oliveira,&nbsp;João Paulo Ferreira Rufino,&nbsp;Maria Fernanda Silva Gomes,&nbsp;Rayana Melo Paixão,&nbsp;Aline da Cunha Ferreira,&nbsp;Fernanda Victoria Nery Dias,&nbsp;Adriano Teixeira de Oliveira","doi":"10.1007/s10499-025-01979-w","DOIUrl":"10.1007/s10499-025-01979-w","url":null,"abstract":"<div><p>This study evaluated the effects of cyclic feed restriction on the compensatory growth and physiological responses of juvenile matrinxã (<i>Brycon amazonicus</i>). A total of 600 fish (~ 12 g) were distributed in a completely randomized design with three feeding strategies: continuous feeding (control), alternate fasting (AF), and continuous fasting (CF) over a 56-day period, divided into two phases: 28 days of restriction (phase 1) and 28 days of refeeding (phase 2). Growth performance, feed conversion, hematological parameters, and biochemical indicators were analyzed. At the end of the experiment, fish subjected to AF and CF achieved full compensatory growth, with final weights similar to the control group. The AF treatment exhibited improved feed efficiency, while the CF treatment required a longer refeeding period to restore growth. During phase 1, fish mobilized lipid reserves, as indicated by reductions in the visceral fat index (VSI) and hepatosomatic index (HSI). Short fasting and refeeding cycles led to changes in hemoglobin values and glucose, triglyceride, and cholesterol levels to maintain the physiological homeostasis of <i>B. amazonicus</i> juveniles, suggesting a low physiological impact of cyclic fasting. However, survival rates were lower in the restricted groups, likely due to increased aggressiveness. These findings indicate that cyclic feed restriction can be a viable strategy to optimize feed efficiency and reduce production costs in <i>B. amazonicus</i> farming, provided that fasting duration is carefully managed. Further research should explore the interaction between feeding protocols, experimental conditions, fish size, and stocking densities to enhance sustainable aquaculture practices for this species.</p></div>","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"33 5","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908732","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":"Effects of temperature and thermal shock on growth and health of southern medicinal leech (Hirudo verbana Carena, 1820)","authors":"Mustafa Ceylan,&nbsp;Emin Karataş,&nbsp;Meryem Tunç,&nbsp;Seval Bahadır Koca,&nbsp;Hüseyin Sevgili,&nbsp;Hasan Batuhan Emre Özdoğan,&nbsp;Osman Çetinkaya,&nbsp;Masoumeh Malek","doi":"10.1007/s10499-025-02007-7","DOIUrl":"10.1007/s10499-025-02007-7","url":null,"abstract":"<div><p>The over-collection pressure on medicinal leech populations, coupled with habitat loss, has led to a decline in natural stocks, emphasizing the need for leech aquaculture and standardized production protocols. The effects of water temperature and thermal shock on leech aquaculture remain unclear, making standardization in leech aquaculture challenging. Understanding these effects is also crucial for assessing the impact of global warming on leech populations. This study investigated the impact of different temperatures and thermal shocks on the growth and health of medicinal leeches through two trials. In the first trial, leeches were cultured at four temperatures (15°C, 20°C, 25°C, and 30°C) to determine the optimal range. A quadratic linear decrease in final body weight was observed (<i>P</i>_Quadratic = 0.001), with higher temperatures leading to increased regurgitation and cannibalism, and a lower proportion of healthy leeches. The optimal temperatures for the growth and health of leeches were found to be 18.7°C (<i>R</i>² = 0.701) and 19.7°C (<i>R</i>² = 0.303), respectively. In the second trial, leeches were kept at 18.7°C and exposed to thermal shocks at six temperatures (3.7°C, 8.7°C, 13.7°C, 23.7°C, 28.7°C, and 33.7°C) during triweekly water changes. No significant differences in final body weight were determined among groups (<i>P</i>_Anova = 0.799). Interestingly, cold thermal shocks reduced regurgitation and cannibalism while increasing the proportion of healthy leeches. These findings highlight temperature and thermal shock as critical environmental factors in leech aquaculture. Maintaining temperatures between 18.7 and 19.7°C appears optimal, and cold thermal shocks may have beneficial effects on leech health.</p></div>","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"33 5","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10499-025-02007-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908824","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":"Economic impact of potential aquaculture production in Michigan, USA","authors":"Ingrid M. Sokup,&nbsp;Jenny L. Apriesnig,&nbsp;Lauren N. Jescovitch-Stigers","doi":"10.1007/s10499-025-02008-6","DOIUrl":"10.1007/s10499-025-02008-6","url":null,"abstract":"<div><p>The state of Michigan, USA, places significant value on its fisheries—including fish for fun and fish as food. Commercial fishing has historically contributed to seafood production in Michigan (MI) and its decline is an opportunity for aquaculture to provide supplemental harvest and restoration activities. While recent work has evaluated the economic impacts of aquaculture in different areas of the United States, much is still unknown about aquaculture in Michigan, therefore limiting state resources towards industry growth. As a first step towards understanding the impacts of potential aquaculture growth in Michigan, we perform an economic impact analysis of increased aquaculture within the state. We use the input–output model IMPLAN to evaluate 12 scenarios across three different regions: the State of Michigan, Alcona County, MI, and Delta County, MI. We find that the economic impacts of aquaculture expansion vary by region and that each additional aquaculture job leads to $124,332 in output across the State of Michigan, while each job in Alcona County and Delta County leads to $60,546 and $64,197 in output, respectively. Additionally, our results suggest that beyond providing access to local food, aquaculture has the potential to create employment opportunities, improve community resilience, enhance fisheries management, and spur economic activity in Michigan.</p></div>","PeriodicalId":8122,"journal":{"name":"Aquaculture International","volume":"33 5","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908678","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}