Fish-water substantiation of the recirculation aqua system for the African clary catfish Clarias gariepinus (Burchell, 1822)

Trofymchuk, Alla; Grynevych, Nataliia; Romanchuk, B. A.; Svitelskyi, Mykola

doi:10.32718/nvlvet-a9502

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…C. gariepinus and O. niloticus are native to Africa but are now being bred for mass fingerling production following their successful domestication (Ponzoni & Nguyen, 2008). Some of the advantages of C. gariepinus over other freshwater fish species include rapid growth rates that result in attainment of marketable size within 6 months (Trofymchuk et al, 2021). Other reasons for their culture include tolerance to a wide range of environmental conditions and good feed conversion rates (Abraham et al, 2018).…”

Section: Fish Breedingmentioning

confidence: 99%

The potential impact of aquaculture on the genetic diversity and conservation of wild fish in sub‐Saharan Africa

Sanda,

Metcalfe,

Mable

2024

Aquatic Conservation

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An increasing focus on aquaculture using introduced strains or species poses a serious threat to native wild species in sub‐Saharan Africa, yet almost no policies have been enacted or regulations put in place to address this environmental challenge. Aquaculture in these regions has traditionally been conducted on a relatively small scale but is currently expanding rapidly and is projected to continue increasing in the coming decades, with increasing use of genetically improved strains. This expansion is occurring in a region known for its high biodiversity, creating challenges for increasing fish production without damaging wild fish populations. However, few studies have yet assessed the impacts of changes in aquaculture practice on the genetic composition and diversity of wild populations. The use of non‐native improved strains for aquaculture could cause competition, gene introgression when there is interbreeding with native populations or species, displacement of species and possible extinction of the native wild populations. After providing historical context on African aquaculture, this review describes the current methods of fish breeding and genetic improvement programmes for the main species of cultured fishes, focusing on the potential conservation impacts of the use of introduced (and selectively bred) farmed species. Existing aquaculture policies, legislation and regulations regarding the import and farming of fish are then compared across the main fish‐producing countries. We recommend a regional policy framework considering fish introduction, risk analysis and risk management, human resources development and genetic monitoring that could be drafted into the existing policies to strengthen conservation efforts. We conclude by making recommendations for refining existing regulations and for future research aimed at minimizing the impacts of aquaculture on wild fish populations in sub‐Saharan Africa. Aquaculture in this region needs implementation of responsible guidelines to avoid genetic impacts on native populations of high conservation value.

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Section: Fish Breedingmentioning

confidence: 99%

The potential impact of aquaculture on the genetic diversity and conservation of wild fish in sub‐Saharan Africa

Sanda,

Metcalfe,

Mable

2024

Aquatic Conservation

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“…Личинковий та товарний модулі рибницького комплексу включають в себе блок регенерації води. Вирощування товарної риби проходить в два етапи, кожен з яких триває по 180 днів, повний риб-ницький цикл триває 390 -400 діб (Grynevych, 2016;Trofymchuk et al, 2021).…”

Section: вступunclassified

Monitoring of hydrochemical parameters of the recirculating aquasystem in the early stages of ontogeny of Acipenser Ruthenus

Hrynevych,

Osadcha

2024

SMLNUVMBA

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The technological process of reproduction and rearing of Acipenser Ruthenus, juveniles and older age groups, in industrial fish farms is carried out in recirculating aquaculture systems with constant monitoring of the hydrochemical regime of the aquatic environment and strict adherence to the technology of phased feeding with live and artificial feed. Raising sturgeon species in winter at low temperatures (2–6 ºС) is one of the most difficult technological processes. The selection of Acipenser Ruthenus fry was carried out in February 2024 at a water temperature of 4 °C and gradually increased by 0.5 °C per day for 20 days to prevent a sharp increase, which could provoke active mobility and exhaustion, injury, and weight loss. The water temperature in the pools and trays of the experimental farm fluctuated between 4 and 18 °C during February – March 2024, which corresponds to the generally accepted temperature range for reproduction and rearing of Acipenser Ruthenus. Compliance with the temperature regime and control of the dissolved oxygen content in water directly affects the survival, growth rate and feed consumption efficiency of Acipenser Ruthenus juveniles at juvenile stages of development. Water turbidity is the only indicator that does not comply with GOST 3351-74 and ranged from 1.12–1.53 mg/dm3 with a norm of ≤ 1 mg/dm3, which is 0.01–0.02 % higher than the norm and indicates the ingress of a small amount of meltwater and rainwater runoff into groundwater. Exceeding the norm of turbidity can adversely affect the vital activity of aquatic organisms in recirculating aquaculture systems and affect body weight gain because suspended particles settle on the gills of fish and impair their respiration, food consumption and ionic metabolism. The presence of chlorides of organic origin in water indicates its contamination, but in the studied water samples its content ranged from 14.18–16.31 mg/dm3, which does not exceed the norm according to the Sanitary and Epidemiological Standards. The lack of oxygen in water can affect the accumulation of hydrogen sulfide as a result of the reduction of sulfuric salts and, as a result, lead to an increase in the content of sulfates, but in our case, the hydrochemical analysis of the water samples under study shows that the sulfate content does not exceed the norm and is 13–52.6 mg/dm3. To organise a balanced feeding of young Acipenser ruthenus at this industrial farm, Artemia salina is used as live feed. To obtain live fodder, we incubated pre-prepared Artemia salina eggs, which allows us to obtain a complete feed for feeding Acipenser ruthenus juveniles in a short time. The decontamination of Artemia salina eggs was carried out in incubation devices (with mandatory aeration, which ensures the absence of anaerobic zones in the egg mass and intensive lighting. For incubation, a solution of 50 g (5 % w/v) of sodium chloride (NaCI) per 1 litre of water is prepared, into which eggs are loaded at a density of 5 g/L. For one apparatus, load 10 litres of water and 50 g of Artemia salina eggs. The incubation lasts 24 hours at a water temperature of 27–29 °C. The yield of Artemia salina nauplii from one device is about 80 %.

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Fish-water substantiation of the recirculation aqua system for the African clary catfish Clarias gariepinus (Burchell, 1822)

Cited by 2 publications

References 2 publications

The potential impact of aquaculture on the genetic diversity and conservation of wild fish in sub‐Saharan Africa

The potential impact of aquaculture on the genetic diversity and conservation of wild fish in sub‐Saharan Africa

Monitoring of hydrochemical parameters of the recirculating aquasystem in the early stages of ontogeny of Acipenser Ruthenus

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