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Ontogeny of the digestive tract of thick lipped grey mullet (Chelon labrosus) larvae reared in "mesocosms" ArchiMer
Zouiten, Dora; Ben Khemis, I; Besbes, R; Cahu, Chantal.
This work describes the ontogeny of the digestive tract in thick lipped grey mullet (Chelon labrosus) larvae reared until day 36 post-hatching with the semi-extensive technology in mesocosms. Diet was constituted by live preys, rotifers, Arternia and wild zooplankton, then compound diet was added from day 20 (p. h.). Linear growth, weight growth and digestive enzymes specific activities were studied during larval ontogeny. Pancreatic enzymes (trypsin and amylase) and intestinal enzymes (leucine-alanine peptidase "Leu-ala", aminopeptidase N "AN" and alkaline phosphatase "AP") were assayed in larvae sampled throughout the rearing trial to evaluate gastrointestinal maturation along the development. The trypsin specific activities were very high during the...
Tipo: Text Palavras-chave: Pancreatic enzymes; Intestinal enzymes; Fish larvae; Mesocosm; Chelan labrosus.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4585.pdf
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Allometric growth patterns and development in larvae and juveniles of thick-lipped grey mullet Chelon labrosus reared in mesocosm conditions ArchiMer
Ben Khemis, Ines; Gisbert, Enric; Alcaraz, Carles; Zouiten, Dora; Besbes, Raouf; Zouiten, Amina; Masmoudi, Ahmed Slaheddine; Cahu, Chantal.
Allometric growth and ontogeny were studied in thick-lipped grey mullet Chelon labrosus reared in mesocosms from 1 to 71 day post hatching (dph). Multivariate allometric analysis of morphometric growth distinguished three distinct developmental stanzas separated by two morphometric metamorphosis lengths (L-m1=4.46 +/- 0.06mm; L-m2= 28.56 +/- 1.04mm). Body mass growth also showed three distinct episodes separated by two inflections, correlated with morpho-functional changes. First episode concerned pre-flexion larvae and ended around 4.5mm-L-T (14-dph), coinciding with estimated L-m1. It was distinguished by reduced growth, but intense morphogenesis and differentiation processes. Organogenesis and allometric changes indicated that development priorities...
Tipo: Text Palavras-chave: Thick-lipped grey mullet; Chelon labrosus; Larval development; Allometric growth; Mesocosm.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00166/27742/26425.pdf
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Comparison of growth, digestive system maturation and skeletal development in sea bass larvae reared in an intensive or a mesocosm system ArchiMer
Zouiten, Dora; Ben Khemis, Ines; Masmoudi, Ahmed Slaheddin; Huelvan, Christine; Cahu, Chantal.
The quality of development in intensive or mesocosm hatchery-reared Dicentrarchus labrax larvae was investigated using physiological indicators assessing ontogeny. Larvae were reared in intensive (120 L tanks) and in mesocosm systems (20 m(3) enclosures) with the same feeding sequence, excluding the wild zooplankton naturally available in mesocosms. Faster growth was recorded since early development [16 day after hatching (DAH)] in the mesocosm. Maturation of the digestive system also occurred earlier as indicated by the higher amylase secretion ratios, the intestinal maturation index (alkaline phosphatase/leucine-alanine peptidase and aminopeptidase-N/leucine-alanine peptidase ratios) and the more developed intestinal epithelium at 23 DAH. Nevertheless,...
Tipo: Text Palavras-chave: Fish larvae; Hatchery; Mesocosm; Ontogenesis; Enzyme; Skeletogenesis.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00051/16225/14064.pdf
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