On the issue of Australian crayfish cultivation in ponds to ensure sustainable aquaculture development

Experimental work has been carried out to optimize the feeding conditions and keeping of red claw crayfish in the conditions of a recirculation aquaculture system (RAS) to increase growth during artificial cultivation and to determine design standards. The lack of functional complete feed and methodological approaches to the maintenance of red claw crayfish necessitated developing the effective methods for the practical implementation of feeding technology and minimizing the impact of side factors. The experiment involved 105 species of Cherax quadricarinatus weighing more than 10 g, which were kept in containers with an area of 1.5 m2 and a volume of 0.3 m3, equipped with shelters, with water artificial aeration, filtration and heating. Three options for compound feed formulations are proposed based on the low-calorie compound feed “Coppens Vital”, which was supplemented with vegetable and animal additives (pollock, cereals, gammarus, bloodworm, pumpkin, carrots). With a daily feeding rate making 4-6% of body weight, there was established a feeding regimen 2 times a day. The absolute and average daily growth in three experimental groups of hydrobionts, the average daily growth rate and the mass accumulation coefficient were calculated. As a result, the composition of a complete diet has been optimized, which makes it possible to increase and stabilize the percentage of leaders and the average group in terms of growth. It is noted that the uneven population growth rate requires sorting depending on the mass and planting density while maintaining the composition of the diets. The study of different stocking densities in fish tanks was carried out on the basis of measuring fish-breeding and biological indicators, which complement the general characteristic of the limiting values of RAS operation when keeping objects, which can be used as regulatory documentation for stabilizing economically important features of grown aquaculture objects. The information obtained is opportune and helps avoid technological losses in the production of aquaculture products.

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Biotechnical indicators of red-clawed crayfish commercial cultivation in pond aquaculture in the conditions of the South of Russia

Pyatikopova,

Bedritskaya,

Tangatarova

et al. 2023

Vestnik of Astrakhan State Technical University. Series: Fishing Industry

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Work was carried out on commercial cultivation of the australian red-clawed crayfish Cherax quadricarinatus in the pond aquaculture of the Astrakhan region in the summer-autumn period of 2021 and 2022. During the exper-iment, young crayfish were studied, formed in 5 groups in accordance with the initial average weight of 0.17, 0.18, 1.8, 5.1 and 7.8 g and cultivated in ponds with an area of 0.1 hectares each. The duration of cultivation was 62-99 days, depending on the groups under consideration. During the work, the main size and mass characteristics of cancers in each group were determined, linear growth, weight gain, bio-mass, survival, overall cancer productivity, and the yield of marketable products were calculated. Also, the hydrochemical parameters of the environment and the feed base of the ponds were monitored, the values of which characterized the condition of the ponds as satisfactory for the cultivation of crayfish. The average daily water temperature during the work period was in the range of 24.0-25.0 ºC on average. It is determined that the optimal period of cultivation of ARCC under natural temperatures should be at least 3 months. The average weight of young crayfish planted in ponds for cultivation can be 0.2-8.0 g, depending on the tasks set: obtaining a larger number of crayfish within an average weight of 40 g, obtaining a smaller number, but larger individuals (60-80 g). It is most effective to plant juveniles of an average weight of at least 2 g in ponds. Cultivation of early ARCC juveniles in ponds in the South of Russia to produce commercial cancers is less effective, but it is possible due to the highest yield of commercial products per hectare of area among the groups of cancers under consideration. The hydrochemical regime of reservoirs must meet the biological requirements of the species. The condition of ponds, and in particular, the rapid development of aquatic vegetation in the water column during cultivation can significantly reduce the natural cancer productivity of reservoirs.

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On the issue of Australian crayfish cultivation in ponds to ensure sustainable aquaculture development

Cited by 4 publications

References 12 publications

Organic Aquaculture: Development Trends and Practical Experience

Organic Aquaculture: Development Trends and Practical Experience

Optimization of production of australian crayfish in RAS in the Altai cancer farm

Biotechnical indicators of red-clawed crayfish commercial cultivation in pond aquaculture in the conditions of the South of Russia

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