Fish Physiology and Biochemistry

, Volume 39, Issue 4, pp 967–977 | Cite as

Functional changes in digestive enzyme activities of meagre (Argyrosomus regius; Asso, 1801) during early ontogeny

  • Cüneyt Suzer
  • H. Okan Kamacı
  • Deniz Çoban
  • Şükrü Yıldırım
  • Kürşat Fırat
  • Şahin Saka


The ontogenesis of main pancreatic and intestinal enzymes was investigated in the recent promising Mediterranean candidate species of meagre, Argyrosomus regius, during larval development until 40 days after hatching (DAH). The green-water technique was carried out for larval rearing. Whole-body homogenates were used for enzymatic analysis in larvae younger than 15 DAH; after this date, older larvae were dissected into two segments as pancreatic and intestinal segment. Trypsin was detected as early as hatching and sharply increased concurrently with age and exogenous feeding 15 DAH, but constant decline was observed until the end of experiment. Amylase was determined at 2 DAH and sharply increased 10 DAH. Then, slight decreases were found between 10 and 15 DAH, and then slow alterations were continued until the end of the experiment. Lipase was firstly measured on day 3; then, sudden decline was observed between 20 and 25 DAH. After this date, slow fluctuations were maintained until the end of the experiment. Pepsin was firstly assayed 15 DAH related to gastric gland secretion and sharply increased 30 DAH. Then, it slowly varied until end of the experiment. Enzymes of brush border membranes, alkaline phosphatase and aminopeptidase N showed similar pattern on specific activities during the first 10 days. Thereafter, while specific activity of alkaline phosphatase slightly decreased 15 and fluctuated until 20 DAH, aminopeptidase N activity slowly increased 20 DAH. Then, activity of alkaline phosphatase and aminopeptidase N constantly increased 30 DAH, indicating maturation of the intestinal digestive process, and also, these activities continued to slowly increase until the end of the experiment. The specific activity of cytosolic peptidase, leucine–alanine peptidase, smoothly increased on day 8, then fluctuated until 15 DAH. After this date, in contrast to enzymes of brush border membranes, it sharply decreased 25 DAH and continued to gradually decline until the end of the experiment. These converse expressions were indicative of a maturation of enterocytes and the transition of an adult mode of digestion.


Digestive enzymes Ontogeny Larvae Argyrosomus regius Meagre 



The authors wish to thank the staff of the Kılıç Sea Products Inc., Güvercinlik R&D hatchery, Bodrum, Muğla, Turkey, where the experiments were conducted, for their most efficient technical assistance.


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Copyright information

© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  • Cüneyt Suzer
    • 1
  • H. Okan Kamacı
    • 1
  • Deniz Çoban
    • 2
  • Şükrü Yıldırım
    • 1
  • Kürşat Fırat
    • 1
  • Şahin Saka
    • 1
  1. 1.Aquaculture Department, Faculty of FisheriesEge UniversityBornovaTurkey
  2. 2.Department of Aquaculture Engineering, Faculty of AgricultureAdnan Menderes UniversityAydınTurkey

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