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Controlled hatchery production of Clarias gariepinus (Burchell 1822): an investigation of tank design and water flow rate appropriate for Clarias gariepinus in hatcheries
Author(s) -
HAYLOR G. S.
Publication year - 1992
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.1992.tb00808.x
Subject(s) - clarias gariepinus , biology , hatchery , fishery , water flow , volumetric flow rate , flow (mathematics) , fish <actinopterygii> , catfish , environmental engineering , mechanics , engineering , mathematics , geometry , physics
Circular tanks are appropriate for Clarias gariepinus (Burchell) culture. Wide/shallow tanks (with a diameter to depth ration of about 10) are preferable to narrow/deeper tanks. The optimal flow rate for larvae will be one which provides sufficient oxygen yet does not generate a current velocity fast enough to cause them to swim against it. However, current velocity, for a given type and orientation of inflow, will depend particularly upon tank diameter to depth ratio and flow rate and will be related to position within the tank. Therefore for a given circular tank design a theoretical maximum flow rate and concomitant biomass can be estimated for a given mean fish size. Once airbreathing begins the optimal flow rate for fry is simply that which does not elicit swimming.