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The changes in digestive enzymes and hormones of gilthead seabream larvae (Sparus aurata, L 1758) fed on Artemia nauplii enriched with free methionine
Naz, M.; Türkmen, M. (2009). The changes in digestive enzymes and hormones of gilthead seabream larvae (Sparus aurata, L 1758) fed on Artemia nauplii enriched with free methionine. Aquacult. Int. 17(3): 243-256
In: Aquaculture International. Springer: London. ISSN 0967-6120, more
Peer reviewed article

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Keywords
    Alkaline phosphatase; Amylase; Bombesin; Cholecystokinin; Trypsin; Trypsin; Sparus aurata Linnaeus, 1758 [WoRMS]; Marine

Authors  Top 
  • Naz, M.
  • Türkmen, M.

Abstract
    Variations in digestive enzymes and hormones during the larval development
    of gilthead seabream (Sparus aurata) fed on live prey (Artemia nauplii) enriched with free
    methionine were investigated for 16 days (from day 24 to day 40). Prior to initiation of the
    experiment, newly hatched larvae were transferred from incubators to fiber glass tanks
    (300 l) with black walls and fed with same diets until day 24. Each experiment was
    performed in triplicate. In the experimental group, the content of the free methionine in the
    Artemia nauplii was increased by adding a 5.3 mM free methionine solution to the culture
    water during a 16-h enrichment period. The larvae of both the control and enrichedmethionine
    groups were sampled four times, with 4-day intervals between samplings,
    during a 16-day period. The larvae in the control group had a significantly lower growth
    than those of the methionine group at the end of the study (P>0.05). The highest trypsin
    activity and leucine aminopeptidase N/leucine–alanine peptidase ratios were observed in
    the control group. A significant difference between bombesin activities in the treatment
    groups was not found at 5th minute after the initiation of feeding (P>0.05), but they were
    significant at 15th minute post-initiation of feeding (P>0.05). A significant difference
    between the cholecystokinin levels of the treatment groups was found (P>0.05).

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