Avances en el Cultivo del Pescado Blanco de Pátzcuaro Chirostoma estor estor
Palabras clave:
Chirostoma estor estor, larviculture, oral anatomical structures, digestive capacity, temperature, salinity, culture conditions.Resumen
Silverside fish, Chirostoma estor estor, is an important native species in Lake Pátzcuaro
(Michoacán, México). Unfortunately, this species is under a strong fishing pressure. There
have been some previous studies to establish the basic requirements for its culture, but still
very little is known about its larviculture and rearing. The present study deals with: 1) the
description of the anatomical structures of the mouth under electronic microscopy, showing
that this species is a zooplanktophagous fish; 2) the main embryological and larval
development stages, showing a small egg and a short eclosion period, typical of marine
fishes; 3) the temperature and salinity culture conditions and methods that our group have
implemented for the artificial fertilization, incubation of eggs and thorough life cycle
culture; 4) first feeding with marine rotifers and Artemia nauplii, weaning after 25 days
with artificial diets; 5) total proteolytic as well as some specific proteolytic enzymes were
evaluated in C. estor estor larvae. It is shown that tripsin-like enzymes are the most active
and important for protein digestion, since yolk-sac larvae to adult stage, suggesting a
functional digestive system and its ability to digest live and inert food, and 6) C. estor estor
have shown a typical carnivorous 1:0.7 (digestive tract: total length) ratio, but it seems that
does not have a real anatomical and functional stomach as the whole digestive tract have
shown a high pH along it and a very low activity of pepsine-like protease.
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