scholarly journals Growth, feed conversion, sexual maturation and cataract formation in coho and Atlantic salmon post-smolts reared at different salinities in recirculating aquaculture systems for over one year

2021 ◽  
Author(s):  
Yuanchang Fang ◽  
Joshua Emerman ◽  
Victor Chan ◽  
Kevin Stiller ◽  
Colin Brauner ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Sexual Maturation ◽  
Coho Salmon ◽  
Market Size ◽  
Cataract Formation ◽  
Feed Conversion ◽  
Recirculating Aquaculture ◽  
Recirculating Aquaculture Systems ◽  
One Year

There is an increasing interest in defining optimal conditions to rear salmon to market size in recirculating aquaculture systems (RAS). Salinity however, as a parameter that can be potentially manipulated, has been poorly studied. To address this knowledge gap, we reared coho (Oncorhynchus kisutch Walbaum, 1792) and Atlantic (Salmo salar Linnaeus, 1758) salmon from smolt to market size over ~460 days at five different salinities (0, 5, 10, 20 and 30 ppt) and examined their growth performance. We found that both species reared at intermediate salinities (5-10 ppt) started to show significantly larger body mass than fish reared either in freshwater or full-strength seawater at around day 250-300. These growth-enhancing effects were maintained until day 460. The higher growth in Atlantic salmon at intermediate salinities was associated with reduced economic feed conversion ratio, but this was not observed in coho salmon. The all-female coho salmon showed no incidence of sexual maturation and negligible cataract formation, while the mixed-sex Atlantic salmon showed high levels of sexual maturation (up to 50%) and presence of cataracts (up to 60%). Our results indicate that all-female coho salmon may be better suited to RAS than Atlantic salmon in some aspects. However, in both species, long-term rearing at intermediate salinities improves growth in RAS.

scholarly journals Analysis of Aquaponic-Recirculation Aquaculture System (A - Ras) Application in the Catfish (Clarias gariepinus) Aquaculture in Indonesia

2021 ◽  
Vol 21 (3) ◽  
pp. 93-100
Author(s):  
Arning Wilujeng Ekawati ◽  
Siti Mariyah Ulfa ◽  
Citra Satrya Utama Dewi ◽  
Abdul Aziz Amin ◽  
Lutfi Ni’matus Salamah ◽  
...  
Keyword(s):  
Water Quality ◽  
Clarias Gariepinus ◽  
Feed Conversion ◽  
Water Spinach ◽  
Recirculating Aquaculture ◽  
System A ◽  
Recirculating Aquaculture Systems ◽  
Recirculation Aquaculture System ◽  
Nitrate And Nitrite ◽  
Additional Income

Water quality and waste management are significant problems for aquaculture in Indonesia, including catfish (Clarias gariepinus) aquaculture. A combination of Aquaponics Systems and Recirculating Aquaculture Systems (A-RAS) has been developed to address this problem. This study analyzed A-RAS application for catfish (Clarias gariepinus) aquaculture by comparing water quality and production indicators between A-RAS and conventional methods. The results show that temperature, pH, dissolved oxygen, total organic matter, ammonia, nitrate and nitrite in A-RAS technology were 28.0-30.0°C, 6.5-7.9, 3.8-7.8 mg/L, 18.54-24.97 mg/L, 0.12- 0.28 mg/L, 0.12-0.13 mg/L, and 0.04-0.13 mg/L, respectively. Survival Rate, Feed Conversion Ratio, and harvest in A-RAS application were 85.5%, 1.1, and 26 kg/m³, respectively. A-RAS technology can maintain water quality to be reused in cultivation and increase yields by about 13%. Besides, water spinach can be an additional income for farmers.

scholarly journals Sexual maturation in Atlantic salmon male parr may be triggered both in early spring and late summer under standard farming conditions

2021 ◽  
Author(s):  
Elia Ciani ◽  
Kristine von Krogh ◽  
Rasoul Nourizadeh-Lillabadi ◽  
Ian Mayer ◽  
Romain Fontaine ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Sexual Maturation ◽  
Late Summer ◽  
Early Spring ◽  
Plasma Testosterone ◽  
Farmed Salmon ◽  
Early Maturing ◽  
Advanced Stages ◽  
One Year ◽  
Immature Fish

AbstractMale Atlantic salmon (Salmo salar) display different sexual strategies, maturing either as parr during the freshwater phase (as sneaky spawners), or as post smolts following one or several years at sea. First sexual maturation (puberty) occurs at different times depending on environmental and genetic factors. To improve our knowledge on the timing (age and season) of first sexual maturation in Atlantic salmon male parr, we investigated pubertal activation in second generation farmed salmon from the Norwegian river Figgjo, reared under natural conditions of photoperiod and water temperature. Histological analysis, in combination with morphometric measurements, plasma androgen levels and pituitary gonadotropin gene expression analysis revealed that, as previously reported, some male parr initiated early sexual maturation in spring at one year of age. Interestingly, some male parr were observed to initiate sexual maturation already in autumn, six months after hatching (under-yearlings), much earlier than reported in previous studies. One-year old maturing males showed a low induction in gonadotropin levels, while under-yearling maturing males displayed a significant increase in fshb transcripts as compared to immature fish. Plasma testosterone, detectable also in immature males, increased constantly during testes development, while 11-ketotestosterone, undetectable in immature and early maturing males, increased during more advanced stages of maturation. A mild feminization of the testes (ovotestes) was detected in a subset of samples. This study brings new knowledge on the little investigated field of sexually maturing under-yearlings in Atlantic salmon. This is also the first study comparing the physiology of under-yearling vs one-year old maturing male parr, thus bringing new insights to the remarkable plasticity of Atlantic salmon puberty.

scholarly journals Life cycle assessment of recirculating aquaculture systems: A case of Atlantic salmon farming in China

2019 ◽  
Vol 23 (5) ◽  
pp. 1077-1086 ◽  
Author(s):  
Xingqiang Song ◽  
Ying Liu ◽  
Johan Berg Pettersen ◽  
Miguel Brandão ◽  
Xiaona Ma ◽  
...  
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Atlantic Salmon ◽  
Salmon Farming ◽  
Recirculating Aquaculture ◽  
Recirculating Aquaculture Systems

scholarly journals Effect of Different Routes of Vaccination against Aeromonas salmonicida on Rearing Indicators and Survival after an Experimental Challenge of Pikeperch (Sander lucioperca) in Controlled Rearing

Vaccines ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 476
Author(s):  
Patrycja Schulz ◽  
Elżbieta Terech-Majewska ◽  
Andrzej Krzysztof Siwicki ◽  
Barbara Kazuń ◽  
Krystyna Demska-Zakęś ◽  
...  
Keyword(s):  
Growth Rate ◽  
Experimental Infection ◽  
Challenge Test ◽  
Aeromonas Salmonicida ◽  
Feed Conversion ◽  
Daily Growth ◽  
Rate Condition ◽  
Recirculating Aquaculture ◽  
Recirculating Aquaculture Systems ◽  
Controlled Rearing

Bacterial diseases are a significant problem in the controlled rearing of fish. Furunculosis (Aeromonas sp.), flavobacteriosis (Flavobacterium sp.), and pseudomonadosis (Pseudomonas sp.) are currently the most frequently identified diseases in recirculating aquaculture systems of various fish species. Such a situation is also observed in pikeperch rearing. Due to the emerging difficulties of effective prophylaxis using commercial vaccines, interest in the use of autovaccinations is increasing, not only in ichthyopathology but also in other veterinary fields. Our research aimed to assess the effect of the vaccination method on the overall condition of the fish and survival after the experimental infection with Aeromonas salmonicida. Pikeperch were vaccinated by (1) bath, (2) a single i.p. injection, or (3) feed. The fish were measured and weighed on day 0 and after 28 and 56 days of the experiment. Specific growth rate, daily growth rate, condition factor, and feed conversion ratio were calculated. On days 7, 14, 21, and 28 of the experiment, ceruloplasmin and lysozyme levels were rated. In addition, a challenge test was performed. The obtained results showed that the method of vaccination is important and affects the growth of fish, the overall condition of fish, and survival after experimental infection.

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