OBSERVATIONS REGARDING THE EMBRYONARY AND LARVAL DEVELOPMENT OF STERLET (ACIPENSER RUTHENUS)
Keywords:
sterlet, embryo, larvae, developmentAbstract
Studying and presenting the embryo stages of sterlet has the main purpose of
widening the knowledge horizon in this direction. Although all sterlet
embryos originated from one female and from the same incubator (15°C, 9.6
mg/l of dissolved oxygen and a water flow of 2.7 l/min), they are in different
stages of development at a certain time. Because the asynchronous
development of embryos from one incubator is maintained throughout the
incubation period, it is explained why not all embryos hatch at the same time.
The first hatchings appear at the age of 145 hours from fecundation, the
larvae have a very large yolk sack and are moving very fast, especially in
obliquely upward direction. At one hour from hatching, the larvae presents
clear opercularly movements. The last hatching occurs 193 hours from
fecundation. The larval stage for Acipenser ruthenus lasts for 7-8 days,
probably the larvae that hatched sooner have also a quicker absorption of
yolk sack.
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