Yellowtail snapper (Ocyurus chrysurus) is one of the most important Lutjanids species in the Caribbean due to its great importance in recreational and commercial fishing activities. Studies related to digestive physiology are essential to improve survival after hatching as high mortalities have been reported during larviculture. The aim of this study was to determine the changes in the activities of alkaline and acid proteases, trypsin, chymotrypsin, leucine aminopeptidase, lipase, amylase and alkaline phosphatase in O. chrysurus during their initial ontogeny through biochemical techniques. Larvae were fed with live prey (Nannochloropsis sp and Brachionus rotundiformis) from the opening mouth until 10 days after hatching (DAH), subsequently fed with rotifers and Artemia sp. nauplii until 15 DAH and finally were feed with enriched lipid emulsion Artemia sp. metanauplii to 42 DAH. Activities of most alkaline digestive enzymes started 5 DAH expressing differentially according to larval growth and larvae live diet. Furthermore, the activity of pepsin in O. chrysurus peaked at 34 DAH, suggesting the presence of a functional stomach. It is concluded that the early activity of most alkaline enzymes reflects the contribution of pancreatic and cytosolic enzymes, and that the weaning period could start after 34 DAH after the observed peak of levels.
Karyotypic characterization in mitosis and meiosis of the common snook Centropomus undecimalis (Pisces: Centropomidae). The common snook Centropomus undecimalis inhabits marine, brackish and freshwater habitats in the Western Central Atlantic Ocean, including the Gulf of Mexico. Common snook is an economically important fish in many localities, nevertheless the number of studies on its biology and genetics are still few. The present study attempts to establish the cytogenetic profiles of the specimens collected in Paraiso Municipality Tabasco, Mexico. Tissue of five females and eight male organisms were processed by conventional cytological techniques to obtain chromosome slides of high quality in order to assemble the karyotype. The results from the kidney tissue analysis showed that 85.1% of 288 mitosis had a 2n=48 chromosomes, and 52.8% of 104 meiosis exhibited the haploid number 1n=24. The diploid karyotype showed 48 monoarmed chromosomes of the telocentric (T) type. There was no chromosome heteromorphism between females and males. The diploid karyotype was very similar to that observed in the majority of marine fishes. Rev. Biol. Trop. 59 (2): 683-692. Epub 2011 June 01.
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