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Developmental Changes in Digestive Enzymes Activity of Black Rockfish Sebastes inermis  

Gwak Woo-Seok (Division of Marine Bioscience, The Institute of Marine Industry, Gyeongsang National University)
Park Dae-Won (Gyeongsangnam-do Fisheries Resources and Research Institute)
Publication Information
Journal of Aquaculture / v.19, no.2, 2006 , pp. 125-132 More about this Journal
Abstract
Black rockfish larvae and juveniles were reared for 95 days after parturition (DAP) in order to determine four enzyme activities (trypsin, pepsine-like enzyme, lipase, amylase) during ontogeny. Larvae were fed rotifers Brachionus plicatilis from 1 to 25 DAP, Artemia nauplii from 10 to 78 DAP and then gradually changed to pelleted feed from 30 DAP. Temperature was kept between $13.5{\sim}14.9^{\circ}C$. Trypsin and lipase activities were found in 2 DAP larvae ($7.0{\pm}1.5$ unit and $4.5{\pm}1.4$ unit, $mean{\pm}SD$, respectively). The evolution of both enzymes activities showed a profile marked by drastic increases between postflexion and juvenile stage. There is an increment on specific trypsin activity at 10 DAP, corresponding with the beginning of Artemia feeding. Pepsin-like enzyme activity was found at 11 DAP and increased drastically from 56 DAP, cor-responding with the initiation of juvenile stage. Amylase activity was also found at 11 DAP and maintained at a low level up to 38 DAP followed by a drastic increase from 39 DAP to 50 DAP. Considering our results of both trypsin and pepsin-like enzyme activities, it might be concluded that higher somatic growth of Sebastes inermis could be possible with the initiation juvenile of stage and the early juvenile stage is a suit-able period for feeding an artificial diet for fish.
Keywords
Sebastes inermis; Trypsin; Pepsin-like enzyme; Lipase; Amylase; Protein;
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  • Reference
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