Food intake and growth of adult Atlantic cod (Gadus morhua L.) reared under different conditions of stocking density, feeding frequency and size-grading

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Abstract

The combined effects of stocking density, feeding frequency and size-grading on feeding and growth of adult Atlantic cod (Gadus morhua L.) were measured in a series of four experiments. Specific growth rates decreased from a maximum of 1.08%/day at 2 kg/m3 stocking density to 0.66% at 40 kg/m3 density. Over 2 months, biomass increased 60-89% in fish stocked at low densities (< 10 kg/m3) but only by 50% in those held at high stocking density (40 kg/m3). Cod fed to satiation twice a week had lower growth rates than those fed three or five times a week, but growth rates did not differ significantly between cod fed three and five times weekly. However, when stocked at 40 kg/m3, cod fed five times a week tended to show better growth than cod fed three times per week. Growth rates of larger maturing cod with high initial condition factors did not improve when feeding frequency was increased to more than two meals per week. Size-grading had a significant effect on growth. Growth rates of 0.50% and 0.45%/day were recorded for cod that were size-sorted and stocked at 10 and 30 kg/m3, respectively, compared to 0.78% and 0.55%/day for cod of the same sizes reared in unsorted groups at the same densities. Size-sorting had no significant effect on growth rates of cod stocked at 40 kg/m3. Crown Copyright © 2001 Published by Elsevier Science B.V.

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Lambert, Y., & Dutil, J. D. (2001). Food intake and growth of adult Atlantic cod (Gadus morhua L.) reared under different conditions of stocking density, feeding frequency and size-grading. Aquaculture, 192(2–4), 233–247. https://doi.org/10.1016/S0044-8486(00)00448-8

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