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Changes in digestive enzymes activities during the initial ontogeny of wolf cichlid, Parachromis dovii (Perciformes: Cichlidae) Neotropical Ichthyology
Frías-Quintana,Carlos Alfonso; Álvarez-González,Carlos Alfonso; Guerrero-Zárate,Rocío; Valverde-Chavarría,Silvia; Ulloa-Rojas,Juan B..
ABSTRACT Wolf cichlid, Parachromis dovii, is a species with a high potential for aquaculture in Central America; however, the knowledge of the digestive physiology in larvae period is limited. For these reason, this study evaluated the changes on digestive enzymes (alkaline and acid proteases, trypsin, chymotrypsin, aminopeptidase, carboxypeptidase, lipases, amylases, and phosphatases) during early ontogeny by biochemical analysis. All digestive enzymes were detected at first feeding (6 days after hatching, DAH, 9.49 mm, 168 degree-days DD). Afterwards all enzymes reached two main peaks in activity at 14 or 22 DAH (15.10 mm, 364 DD and 20.83 mm, 550 DD, respectively). Later, there was a gradual decrease in activity for trypsin and acid and alkaline...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Larviculture; Proteases; Zymogram.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000100215
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Larval development of the Mexican Snook, Centropomus poeyi (Teleostei: Centropomidae) Neotropical Ichthyology
Kubicek,Kole M.; Álvarez-González,Carlos Alfonso; Martínez-García,Rafael; Contreras-Sánchez,Wilfrido Miguel; Pohlenz,Camilo; Conway,Kevin W..
ABSTRACT We document for the first time the early ontogeny of Centropomus poeyi based on captive raised material representing 0-19 days posthatch (dph). The achievement of early developmental landmarks (i.e., yolk-sac depletion, flexion, development of fins) and changes in pigmentation are described (1.4 mm NL-10.6 mm SL; 0-19 dph) and documented for a subset of individuals using high quality photographs. The ontogeny of the viscerocranium is also described (2.4 mm NL-10.6 mm SL; 6-19 dph). Development in C. poeyi occurs over a short period with attainment of the juvenile stage (i.e., full complement of fin rays present in each fin) occurring by 6.9 mm SL. The ontogeny of external pigmentation in C. poeyi is marked by two trends throughout growth: (1) a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aquaculture; Morphology; Ontogeny; Perciformes; Viscerocranium.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000100204
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