Journal of The World Aquaculture Society最新文献

{"title":"Effect of Cuminum cyminum essential oil on growth, histology, intestinal histomorphology, blood parameters, gonadal development, antioxidant activity, and disease resistance against Aeromonas hydrophila in Cyprinus carpio","authors":"Nalan Ozgur Yigit, Secil Metin, Hakan Didinen, Berrin Cetinkaya, Ozlem Ozmen","doi":"10.1111/jwas.13099","DOIUrl":"https://doi.org/10.1111/jwas.13099","url":null,"abstract":"This study investigated the effects on growth performance, intestinal histomorphology, blood parameters, gonadal development, antioxidant activity, and disease resistance against <jats:italic>Aeromonas hydrophila</jats:italic> of carp fed with cumin. Fish were fed diets containing 0, 1.0, and 3.0 mL kg<jats:sup>−1</jats:sup> cumin for 60 days. At the end of the experiment, the use of cumin oil did not affect growth performances and survival rate after challenge with <jats:italic>A. hydrophila</jats:italic> (<jats:italic>p</jats:italic> &gt; 0.05). However, villi length and goblet cells increased in carp fed with cumin diets. In addition, no pathological findings were observed in the hepatopancreas, gonad, and intestine tissues of carp fed with cumin. Total protein; albumin; aspartate aminotransferase, alanine aminotransferase, and alkaline phosphatase levels; superoxide dismutase; and catalase activity were similar in cumin oil supplemented groups compared with the control. Both male and female fecundity increased with the addition of 1.0 mL kg<jats:sup>−1</jats:sup> cumin, whereas the addition of 3.0 mL kg<jats:sup>−1</jats:sup> cumin caused a slight decrease in fertility. As a result, the use of cumin essential oil at 1 mL kg<jats:sup>−1</jats:sup> concentration can be recommended to improve fish health and increase fertility in carp culture.","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142227521","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":"Role of ginger in fish nutrition with special emphasis on growth, health, gut and liver morphology","authors":"Ishtiyaq Ahmad, Misbah Irm, Imtiaz Ahmed, Yin Haoran, Sehrish Taj, Tahir Ahmad Bhat, Saba Khursheed Khan, Sabah Mushtaq Puswal, Hala Saber Khalil, Mentor Sopjani, Helena Peres, Caterina Faggio, Mohd Ashraf Rather, Adnan Amin","doi":"10.1111/jwas.13101","DOIUrl":"https://doi.org/10.1111/jwas.13101","url":null,"abstract":"Ginger, <jats:italic>Zingiber officinale,</jats:italic> is a medicinal herb widely used for its distinct flavor and medicinal properties. It contains various bioactive compounds, including zingerone, shogaols, gingerol saponin, polyphenols, and flavonoids, which confer anti‐inflammatory, antioxidant, and immunomodulatory effects. Ginger and its derivatives such as powder, essential oil, and active ginger extracts have been used as natural functional ingredients with health‐promoting and disease‐preventing properties. In recent studies, ginger derivatives have been tested in aquafeeds for their potential as safe herbal medicines. They have shown several benefits, acting as growth promoters and modulators of physiological and biochemical functions. Ginger has been found to improve growth performance, modulate immunity, and enhance disease resistance in fish. Its organic constituents exhibit potent anti‐stress, antibacterial, antiviral, and antiparasitic activities, thereby boosting the specific and nonspecific immunity of aquaculture fish. This review provides a comphrensive summary of studies exploring the effects of dietary ginger on various aspects of fish health including growth performance, blood parameters, immunity, disease resistance, gut morphology, antioxidant status, and molecular mechanisms. Furthermore, the review emphasizes the necessity of elucidating the specific bioactive compounds in ginger responsible for its biological functions and their mechanisms of action against infectious diseases in different fish species.","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182567","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":"Fish production, water quality, and the role of nitrification as an ammonia removal process in intensively aerated hybrid catfish ponds","authors":"Brian D. Ott, Eugene L. Torrans, Craig S. Tucker","doi":"10.1111/jwas.13094","DOIUrl":"https://doi.org/10.1111/jwas.13094","url":null,"abstract":"Six 0.1‐ha earthen ponds with 45 kW/ha of aeration capacity were stocked with hybrid catfish (<jats:italic>Ictalurus punctatus</jats:italic> x <jats:italic>I. furcatus</jats:italic>) ranging from 15,000 to 90,000 fish ha<jats:sup>−1</jats:sup> in 15,000 fish ha<jats:sup>−1</jats:sup> increments to analyze the effect of nitrogen loading on ammonia accumulation and fish production. Minimum dissolved oxygen (DO) concentration was maintained above 3.0 mg O<jats:sub>2</jats:sub> L<jats:sup>−1</jats:sup> to prevent hypoxia‐induced appetite reduction. Stocking density did not impact survival but decreased average fish harvest weight and increased food conversion ratio (FCR). Gross production increased with stocking density and ranged from 7249 to 35,674 kg ha<jats:sup>−1</jats:sup>. Average total (TAN) and un‐ionized ammonia (NH<jats:sub>3</jats:sub>) were not different among stocking densities despite greater nitrogen inputs in ponds with higher feeding rates. Nitrite () and nitrate () concentrations were significantly higher in ponds with higher stocking densities, suggesting that nitrification increased with nitrogen loading. Phytoplankton assimilation of ammonia is the primary ammonia removal process in traditional catfish ponds with modest fish densities and feeding rates. However, in intensively aerated ponds with high feeding rates, nitrification can become an important process for ammonia removal. These data indicate that small earthen hybrid catfish ponds with high aeration capacities can increase catfish production without ammonia accumulating.","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182568","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":"Manipulation impacts of jack mackerel meal in low fish meal diets on growth, feed availability, and biochemical composition of olive flounder (Paralichthys olivaceus) and economic analysis","authors":"Yu Jin Sim, Sung Hwoan Cho, Taeho Kim","doi":"10.1111/jwas.13096","DOIUrl":"https://doi.org/10.1111/jwas.13096","url":null,"abstract":"Manipulation effects of jack mackerel meal (JMM) in the low fish meal (FM) diets substituting 50% FM with meat meal (MM) on growth performance of olive flounder and economic analysis were determined. Seven experimental diets were created. The control (Con) diet contained 60% FM. In the other diets, 50% of the FM level used for the Con diet was substituted with MM, and then graded levels (0, 10, 20, 30, 40, and 50%) of JMM were included at the expense of FM, named the MJ<jats:sub>0</jats:sub>, MJ<jats:sub>10</jats:sub>, MJ<jats:sub>20</jats:sub>, MJ<jats:sub>30</jats:sub>, MJ<jats:sub>40</jats:sub>, and MJ<jats:sub>50</jats:sub> diets, respectively. The experimental diets were distributed to triplicate groups of fish. A total of 525 fish was divided into 21 flow‐through tanks. Fish were hand‐fed to apparent satiation for 8 weeks. Weight gain, specific growth rate (SGR), and feed consumption of fish fed the Con diet were comparable with fish fed the MJ<jats:sub>20</jats:sub>, MJ<jats:sub>30</jats:sub>, MJ<jats:sub>40</jats:sub>, and MJ<jats:sub>50</jats:sub> diets. Weight gain, SGR, and feed consumption of fish linearly improved with JMM inclusion levels in the low FM diets replacing 50% FM with MM. The strong correlation between isoleucine and lysine content among essential amino acids in the experimental diets versus weight gain, SGR, and feed consumption of olive flounder were observed. Dietary treatments did not influence feed utilization, chemical composition, and amino acid profiles of fish. Incorporated 20%–50% JMM as an effective feed attractant and enhancer in the low FM diets replacing 50% FM with MM achieved comparable weight gain, SGR, and feed consumption to fish fed a 60% FM‐based diet. Finally, the MJ<jats:sub>50</jats:sub> diet led to the highest economic profit index (EPI) for farmers.","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182570","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":"Salinity/ionic balance interactions on the zootechnical performance and histology of Litopenaeus vannamei and water quality in a biofloc system","authors":"Mitsuaki Ueno Fukura,&nbsp;Luis Felipe Collazos Lasso,&nbsp;Luis Alejandro Vinatea Arana,&nbsp;Bernardo Baldisserotto","doi":"10.1111/jwas.13093","DOIUrl":"10.1111/jwas.13093","url":null,"abstract":"<p>This study aimed to evaluate the interactions between two low salinities (S = 4 and 8 g L⁻¹) and two ionic balances (Na⁺/Mg⁺²/Ca⁺²/K⁺ ratio, IB1 = 27.6/3.6/1.05/1 and IB2 = 40.6/4.7/1.98/1) on zootechnical performance and histology of <i>Litopenaeus vannamei</i> postlarvae (0.0073 ± 0.0007 g) and juveniles (0.2163 ± 0.0080 g) reared in a biofloc system at stocking density of 1500 and 300 individuals m⁻³, respectively, over two culture phases: nursery (30 days) and grow-out (60 days). High nitrification processes were detected at lower salinity treatments, with the lowest ammonia and nitrite concentration in those. There were no significant differences on shrimp survival between treatments; however, the best final weights were observed in the S8IB2 (0.24 ± 0.01 g) and S4IB1 (2.80 ± 0.12 g) treatments for the nursery and grow-out stages, respectively. The most frequent histological lesions were the absence of lipid vacuoles in the hepatopancreas and abundant organic debris in the gill lamellae. The viability of rearing <i>L. vannamei</i> juveniles in biofloc at low salinity is still relatively weak because of their low growth and low efficiency to store fatty acids in the hepatopancreas; however, higher postlarvae productivity was found at 8 g L⁻¹ and Na⁺/Mg⁺²/Ca⁺²/K⁺ ratio of 40.6/4.7/1.98/1 in the nursery stage.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13093","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142223919","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 contribution of U.S. aquaculture farms","authors":"Ganesh Kumar, Shraddha Hegde, Jonathan van Senten, C. Engle, Noah C. Boldt, Matthew Parker, K. Quagrainie, Benedict Posadas, Frank Asche, M. Dey, Suja Aarattuthodi, Luke A. Roy, Russell Grice, Quentin Fong, Michael Schwarz","doi":"10.1111/jwas.13091","DOIUrl":"https://doi.org/10.1111/jwas.13091","url":null,"abstract":"Economics is the study of the allocation of scarce resources to meet human wants and needs and has a critical role to play in addressing challenges related to environmental sustainability, community resilience, and food security. In the context of aquaculture, the key to such a discussion is understanding the linkages of aquaculture farming businesses with other economic sectors and how policy decisions that affect aquaculture result in economic ripples throughout local, regional, and national economies. The only previous national estimates of the economic contributions of U.S. aquaculture are nearly 30 years old. The current study was based on comprehensive data from detailed farm‐level surveys (that captured 77% of the total value of U.S. aquaculture) supplemented by information from publications on the remaining aquaculture sectors. The economic contributions measured in this study were limited to those at the farm level and do not include subsequent impacts that occur as farmed products move through processing, distribution, food service, and retail sectors in the U.S. economy. Results showed that U.S. aquaculture farms contributed $4 billion annually and supported more than 22,000 jobs each year. Labor income and value‐added contributions were $1 billion and $3 billion, respectively. Analysis of the linkages of U.S. aquaculture production activities with other economic sectors showed that nearly all (96%) economic sectors were supported to some degree by U.S. aquaculture farms. Foodfish farms generated the greatest contributions, followed by mollusk farms. Freshwater aquaculture farms contributed twice that of the contributions of marine aquaculture because of the greater size of the freshwater aquaculture sector. Growth of both freshwater and marine sectors would increase overall contributions to the economy. Constraints to growth of aquaculture include regulatory barriers that have restricted existing sectors from meeting current demand for their products. The lack of an adequate regulatory framework for offshore marine aquaculture has constrained its growth and development, especially with respect to the rest of the world. Streamlined regulations implemented in a more timely and efficient manner could result in substantially greater economic contributions from existing U.S. aquaculture farms. The total economic impact of U.S. aquaculture production is likely three to four times greater than the farm‐level impacts estimated in this study as a result of impacts that occur as aquaculture products move downstream through various marketing channels. Additional research is needed to measure the impacts of U.S. aquaculture products in the processing, distribution, food service, supermarket, and restaurant levels of the marketing chain to fully capture the total economic contributions from U.S. aquaculture.","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141927959","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":"Evaluation of a carbohydrase (xylanase and glucanase) enzyme complex in diets for Florida pompano Trachinotus carolinus","authors":"William Stites,&nbsp;Alexis Weldon,&nbsp;João Reis,&nbsp;Paulo Ito,&nbsp;Melanie Rhodes,&nbsp;D. Allen Davis","doi":"10.1111/jwas.13095","DOIUrl":"10.1111/jwas.13095","url":null,"abstract":"<p>Florida pompano, <i>Trachinotus carolinus</i>, can be fed soy-based, low-animal protein diets. However, anti-nutritional factors and carbohydrates limit digestibility. Dietary carbohydrase enzymes have been used to improve carbohydrate digestibility in several species and may be beneficial for Florida pompano. The present study was designed to evaluate the effects of using a carbohydrase enzyme complex (Natugrain® TS L, BASF Corporation, Ludwigshafen, Germany) composed of endo-1,4-ß-xylanase and endo-1,4-ß-glucanase (Xyl + Glu) on growth performance, feed utilization, and digestibility in diets fed to juvenile Florida pompano. A growth trial was conducted with iso-nitrogenous (40%) and iso-lipidic (8%) test diets containing 0, 0.015, 0.030, and 0.045% of Xyl + Glu. The trial was conducted in a recirculating system with 12, 1000-L tanks. Twenty fish (mean weight: 23.34 g ± 1.49 g) were stocked into each tank in a randomized design. Growth results indicated that there were no significant differences (<i>p</i> &gt; 0.05) in growth and feed conversion; however, thermal growth coefficient displayed significant differences (<i>p</i> = 0.0499) between the 0.015 and 0.030% inclusion. All enzymatic treatments displayed significant differences (<i>p</i> = 0.029) in apparent digestibility of crude protein compared with the basal diet. Results indicate that Xyl + Glu enzyme complex can impact protein digestibility but did not significantly affect growth performance.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13095","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141941390","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":"Tolerance of juvenile lumpfish (Cyclopterus Lumpus) to high rearing densities","authors":"Nathaniel N. Spada, Elizabeth A. Fairchild, Jesse T. Trushenski","doi":"10.1111/jwas.13089","DOIUrl":"https://doi.org/10.1111/jwas.13089","url":null,"abstract":"Lumpfish (<jats:italic>Cyclopterus lumpus</jats:italic>) are raised as cleaner fish for controlling sea lice. Intensive rearing is complicated by fin nipping that occurs between juvenile conspecifics. Lumpfish density‐dependent interactions are not well understood; therefore, the effects of rearing density for different fish size classes warranted evaluation. Two size classes (2‐ and 13‐g) of juvenile lumpfish were stocked at four different rearing densities (40, 60, 70, and 90 g/L) with growth, survival, and fish aggression assessed over 8 weeks. Mean weight gain and specific growth rates ranged from 170% to 307% and 1.77% to 2.50%, respectively, depending on density treatments, for the 2‐g fish, and from 286% to 471% and 2.42% to 3.10% for the 13‐g fish. Growth was negatively correlated with density, with faster growth linked to lower densities. No mortality occurred in any treatment and significant fish aggression only occurred among the larger lumpfish in the higher rearing densities. Based on these findings, growth of 2‐g lumpfish can be increased if reared at 40 g/L or slowed at 70 g/L without impacting aggression. For grow out of 13‐g fish to ~70 g with minimal aggression, a 40 g/L rearing density is recommended for faster growth and 60 g/L for slower growth.","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869428","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":"Potential of heat shock protein inducers in mitigating benzo[α]pyrene toxicity in stellate sturgeon fingerlings (Acipenser stellatus): Assessing the effects on CYP450 and AChE activity, HSP70 expression, antioxidant levels, cortisol, and immunological responses","authors":"Leila Vahdatiraad, Behrooz Heidari, Sevda Zarei, Tooraj Sohrabi, Hossein Ghafouri","doi":"10.1111/jwas.13092","DOIUrl":"https://doi.org/10.1111/jwas.13092","url":null,"abstract":"Benzo[α]pyrene (BαP), a polycyclic aromatic hydrocarbon (PAH), is a significant contaminant in the environment, which accumulates and is toxic to invertebrates and fish. The present study aimed to determine the acute toxicity of sublethal concentrations of BαP in the presence of the heat shock protein (HSP) inducer (HSPi) on CYP450 activity, HSP70 gene expression, antioxidant levels, immunological alterations, and AChE activity in stellate sturgeon fingerlings. Two‐hundred and forty fish were exposed to 100 mg L<jats:sup>−1</jats:sup> of Nopal endurance (HSPi) for 4 h. In the next step, the fish were exposed to BαP concentrations equivalent to 25%, 50%, and 75% of the 96‐h LC<jats:sub>50</jats:sub> values. Sampling was carried out on the first, third, and sixth days of the experiment, and the samples were analyzed using two‐way analysis of variance (ANOVA), cluster analysis (CA), and principal component analysis (PCA). The CYP450 activity significantly increased under BαP treatments. Higher expression of the HSP70 gene was observed in the higher concentration of HSPi + BαP treatments. The lowest AChE activity was observed in BαP treatments. However, the activity of superoxide dismutase, catalase, and total antioxidant activity enzymes and immunological responses (lysozyme, IgM, and C3) increased by using HSPi. It can be concluded that the HSP inducer significantly decreased BαP toxicity and resulted in more resistance to stress situations in sturgeon fingerlings.","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782445","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":"Elevated water temperature in combination with an increase in daylength stimulate a synchronized onset of spermatogenesis in male Atlantic salmon (Salmo salar, L.) postsmolts","authors":"Enrique Pino-Martinez,&nbsp;Kari Anne Kamlund,&nbsp;Pablo Balseiro,&nbsp;Marianne Kraugerud,&nbsp;Albert Kjartan Dagbjartarson Imsland,&nbsp;Sigurd O. Handeland","doi":"10.1111/jwas.13090","DOIUrl":"10.1111/jwas.13090","url":null,"abstract":"<p>Male postsmolt maturation (“jacking”) is undesired in Atlantic salmon aquaculture due to economic and welfare impacts. Unfortunately, incidence of jacking has increased linked to intensive rearing conditions. This study subjected 1000 salmon (52.1 ± 5.2 g) to one of two temperatures (15, 12.5°C) and one of two photoperiods (constant light-LL, a 5-week LD12:12 winter signal regime-WS) to assess their effects on spermatogenesis regulation. Indicators included testis histology images, mRNA transcription of gonadotropin receptors for follicle-stimulating hormone (<i>fshr</i>) and luteinizing hormone (<i>lhr</i>), and of factors regulating spermatogenesis like anti-Müllerian hormone (<i>amh</i>), gonadal-soma-derived factors 1 and 2 (<i>gsdf1</i> and <i>gsdf2</i>), and insulin-like growth factor-3 (<i>igf3</i>). High temperature (15°C) induced early testis development processes irrespective of photoperiod, evidenced by presence of type B spermatogonia before clear increases in testis size or any transcriptional changes. The winter signal at 15°C caused a synchronized onset of spermatogenesis not present under constant light. This was evidenced by a pronounced downregulation of the spermatogenesis-inhibiting factor <i>amh</i> and a clear upregulation in the stimulating factor <i>igf3</i>. Consequently, combining high temperatures with winter signal regimes pose risk; high temperature can stimulate early cellular/endocrine processes of spermatogenesis, which can later be synchronized in the population by an increase in daylength.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13090","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141614089","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}