Heads or tails_fish hatching
2011
Lugowska, K. | Sarnowski, P.,University of Natural Sciences and Humanities, Siedlce (Poalnd). Dept. of Animal Physiology
Hatching is a process in which the embryo emerges from the egg by breaking the protective egg shell. Three species of fish: common carp, Cyprinus carpio; barbel, Barbus barbus; and rainbow trout, Oncorhynchus mykiss; were examined for their hatching modes. Observations of embryos and larvae were done using the stereoscopic microscope Nikon connected to the computer with the MultiScan 8.4 image analysis system; the hatching embryos and larvae were photographed. Three modes of hatching were observed, two of them similar in all three fish species. Some fish started hatching tail first from the egg shell, others head first or - specifically for barbel - yolk sac first. The data obtained in the present study showed that tail hatching was the most successful in all fish species, and shown by most good quality larvae
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