Temperature and size effects on the accuracy of estimating postlarval shrimp populations

Autor: D.L. Hutchins, M.P. Hardin, G.W. Chamberlain, D.V. Aldrich
Rok vydání: 1985
Předmět:
Zdroj: Aquacultural Engineering. 4:85-92
ISSN: 0144-8609
DOI: 10.1016/0144-8609(85)90007-x
Popis: The common practice in estimating postlarval penaeid shrimp populations for stocking ponds is volumetric subsampling with subsequent extrapolation. This procedure can lead to considerable undercounting, which, if not recognized, will result in overstocking with accompanying underfeeding and depressed growth. Postlarval blue shrimp Penaeus stylirostris counts derived from volumetric subsampling in a container of known volume and shrimp density were checked for accuracy. Counts were made of three sizes of shrimp (4, 6 and 10·5 mm total lengths) at four temperatures (18, 22, 26 and 30°C). Water temperature and shrimp size both had highly significant (p The population estimates ranged from 100% of the actual population for 4 mm postlarvae at 18°C to 57% for 10·5 mm postlarvae at 30°C.
Databáze: OpenAIRE