Stocking Density for Nursery Production of Redclaw Crayfish, Cherax quadricarinatus, in a Recirculating System

G. M. García-Ulloa, M. R. Pérez-Moreno, D. Rodríguez-González, M. C. Gallo-García, J. T. Ponce-Palafox, H. Rodríguez-González, A. M. Góngora-Gómez

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Abstract

Redclaw crayfish, Cherax quadricarinatus, early juveniles were reared at different stocking densities in a closed recirculation system using 12-L plastic containers as rearing tanks. Initial stocking densities were 1.0, 1.5, 2.0, 2.5, and 3.0 per liter (66, 89, 111, 133, and 156 crayfish/m 2, respectively). Rearing period was 42 days. Each density was tested with five replicates. Shelter (0.112 m 2) was added to double the surface area of rearing tanks. Animals were fed ad libitum twice a day with a commercial diet containing 35% crude protein. There were no significant differences (P < 0.05) in length and specific growth rate (SGR) among stocking densities. Final weight and daily weight gain, however, were significantly higher at the density of 66 per m 2 (1.0 per liter). Total biomass at harvest increased with density. Survival was affected by stocking density from day 28 onward, decreasing with density from 62.7 ± 7.6% obtained at 66 crayfish/m 2 to 44.85 ± 8.18% at 156 crayfish/m 2. © 2012 Copyright Taylor and Francis Group, LLC.
Original languageAmerican English
Pages (from-to)8-15
Number of pages6
JournalJournal of Applied Aquaculture
DOIs
StatePublished - 1 Jan 2012

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