Abstract
The paper defines the methods for maintenance of maximum density (N max) in respect of the freshwater crayfish (Astacus leptodactylus) fingerlings (larvae/juveniles), a prospective model organism for aquaculture. The question of optimal maintenance of the fingerlings has been addressed in the present study, considering the following parameters: (1) the ratio between the total area on which the fingerlings are being grown, and the area occupied by one individual, and (2) the planting density dependence on the specific growth rate of differently aged individuals (C w). Analysis of our results shows that the N max values decrease significantly with the growth of individuals (4167, 2222 and 617 ind. m−2 for 30, 65 and 120 days old fingerlings, respectively). The values of C w for individuals at the age of 30 days, however, do not depend on rearing density within the range of 300–1500 ind. m−2. A linear decrease in C w is observed in density gradient for older ages. The density at which C w becomes equal to zero is 3553 ind. m−2 for 65 days old fingerlings, and 1307 ind. m−2 for the 120 days old ones. The revealed differences (with respect to growth rates and planting densities in different age groups) may presumably be caused by the influence of the specific mechanisms of an intra-populational regulation, tenable with the conditions of high densities of fingerlings.
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Acknowledgments
These studies were performed in the framework of the International Scientific Project entitled “Ecological and biochemical aspects of the regulation of growth and reproduction in decapod crustaceans and anostracans for the revelation of their potentials in an aquaculture” (DST/INT/BLR/P-6/2014 dated 15 April 2015) carried out by the International Sakharov Environmental Institute of the Belarusian State University (Minsk, Belarus) and the School of Biosciences and Technology, VIT University (Vellore, India). The project is funded by the State Committee on Science and Technologies of the Republic of Belarus and the Department of Science and Technology, Government of India.
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Golubev, A.P., Alekhnovich, A.V., Bodilovskaya, O.A. et al. Some methodological approaches to the definition of limiting density for aquaculture of freshwater crayfish fingerlings. Aquacult Int 25, 715–725 (2017). https://doi.org/10.1007/s10499-016-0065-2
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DOI: https://doi.org/10.1007/s10499-016-0065-2