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Effects of early weaning strategies on growth, survival and digestive enzyme activities in cobia (Rachycentron canadum L.) larvae
Nguyen, H.Q.; Reinertsen, H.; Wold, P-A.; Tran, M.T.; Kjørsvik, E. (2011). Effects of early weaning strategies on growth, survival and digestive enzyme activities in cobia (Rachycentron canadum L.) larvae. Aquacult. Int. 19(1): 63-78
In: Aquaculture International. Springer: London. ISSN 0967-6120, more
Peer reviewed article  

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Keywords
    Digestive glands; Digestive system; Early weaning; Enzymes; Fish larvae; Rachycentron canadum (Linnaeus, 1766) [WoRMS]; Marine

Authors  Top 
  • Nguyen, H.Q.
  • Reinertsen, H.
  • Wold, P-A.
  • Tran, M.T.
  • Kjørsvik, E.

Abstract
    The effects of weaning strategies of cobia (Rachycentron canadum L.) larvae to commercial microdiets, either from rotifers or from Artemia, on growth, survival and enzymatic digestive capacity, were investigated. In the first experiment, cobia larvae were weaned from rotifers by co-feeding with a microdiet (Otohime) from 8, 13 or 20 days post-hatching (dph). The larvae in the control treatment were fed rotifers (2–12 dph), Artemia nauplii from 7 dph, and co-fed with the microdiet from 20 dph. In the second experiment, the larvae were weaned from Artemia, which was fed to the larvae from 7 dph, by co-feeding with a microdiet (NRD) from 8, 13 or 18 dph. The larvae in control treatment were fed rotifers, then Artemia to the end of the experiment (28 dph). Weaning of cobia larvae onto a microdiet directly from rotifers significantly reduced growth, survival and digestive capacity of the larvae and did not lead to larval acceptance of the microdiet, compared to those weaned from Artemia in the first experiment. Early weaning of cobia larvae onto NRD microdiet (on 8 or 13 dph) from Artemia in the second experiment also reduced growth, survival rate and gut maturation index, compared to those fed live feed. With available microdiets, weaning of cobia larvae could start from Artemia at around 18 dph in order to obtain comparable growth, survival and gut maturation to larvae fed live feed.

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