Comparative research of the tench breeders reaction on the endogenous and exogenous stimulation of the sexual products in the industrial and pond reproductive conditions
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CREPIS, Oleg, USATÎI, Marin, STRUGULEA, Oleg, USATÎI, Adrian, RUSU, Vadim. Comparative research of the tench breeders reaction on the endogenous and exogenous stimulation of the sexual products in the industrial and pond reproductive conditions. In: Sustainable use, protection of animal world and forest management in the context of climate change, 12-13 octombrie 2016, Chișinău. Chișinău: Institutul de Zoologie, 2016, Ediția 9, pp. 198-199. ISBN 978-9975-3022-7-2. DOI: https://doi.org/10.53937/9789975302272.99
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Sustainable use, protection of animal world and forest management in the context of climate change
Ediția 9, 2016
Conferința "Sustainable use, protection of animal world and forest management in the context of climate change"
Chișinău, Moldova, 12-13 octombrie 2016

Comparative research of the tench breeders reaction on the endogenous and exogenous stimulation of the sexual products in the industrial and pond reproductive conditions

DOI: https://doi.org/10.53937/9789975302272.99

Pag. 198-199

Crepis Oleg, Usatîi Marin, Strugulea Oleg, Usatîi Adrian, Rusu Vadim
 
Institutul de Zoologie al AŞM
 
Proiecte:
 
Disponibil în IBN: 14 noiembrie 2018



Teza

Tench (Tinca tinca, Linnaeus, 1758) is a rare species in the Moldavian lakes and their less numerous populations are unable to adapt to environmental conditions (habitat damage by changing hydrological regimes of rivers, the backwaters area reduction and the lakes desilting after improvement works). In this connection it is necessary to develop methods of directing the productivity of tench in the natural and artificial reservoirs. The purpose of comparative research conducted in the laboratory has been studying the reaction of the reproducers of tench (in the natural and artificial reservoirs) on the endogenous and exogenous stimulation of spawning under the industrial and pond conditions. The experimental works were held at the breeding fish complex from Moldavian State Regional Electric Station. In the first series of experiments was conducted endogenous and exogenous stimulation of the natural reproduction of tench, captured in the lake and pond and placed in the five plastic containers, decorated with natural and artificial substrate in optimal reproductive conditions. The container 1 were introduced by four females and eight males captured in the pond; the container 2 to 4 females and eight males captured in the lake; the container 3 to 4 females captured in the pond and eight males captured in the lake; the container 4 to 4 females captured in the lake and eight males captured in the pond. The container 4 were introduced by two reproducers groups (one female and three males) captured in the lake during spawning. After three days the reproducers of containers 1-4 were injected with acetone carp pituitary suspension: 0.5 and 5.0 mg / kg for female (with an interval of 12 hours) and for males by 2.0 mg / kg. Reproducers of container 5 have not been stimulated with exohormons. In the second series of experiments we studied the effectiveness of natural reproduction of tench at different stages of domestication in the pond conditions, using artificial, natural and combined substrates. They were experienced three variants. The first variant: in the particular pond were introduced 7 females and 15 males, captured in the lake 1.5 - 2 months until the start of the breeding. Variant two: 10 days before the start of the reproduction, in the particular pond were introduced 7 females and 14 males of tench from the nursery pond, where they were maintained over one year. Variant three: in particular pond were introduced seven females from the lake (capIXtured 1.5 - 2 months before the spawning period) and 14 males from the nursery pond, where they maintained over one year and were captured 10 days until the start of the reproduction. Research has shown that only domesticated reproducers of tench effectively stimulated with exohormons under industrial conditions. In females caught in the lake matured very few low-quality eggs. This is not necessary the hormonal stimulation of spawning domesticated reproducers in the pond. For its maturing enough to maintain optimal thermal conditions and to provide with the appropriate substrate. It was found that the females caught in the lake and introduced into the pond for a natural breeding matured in fewer and spawned fewer eggs. It is in fact explained by the conditions of the tench feeding in a pond. Bat the most likely cause of disturbing the reproductive behavior of wild tench was the influence of stress produced in the process of catching, handling and transporting of fish. While the responsible for lack of reproductive behavior are mostly males. Research of the effectiveness of spawning tench on the various types of substrates have shown that its reproducers prefer natural substrates of the lake. Bat the substrate combination was reported the highest density of eggs filed. This phenomenon can be explained by the fact that the eggs portion, which does not adhere to the vertical stems of natural substrate, is not deposited on the bottom but on the horizontal artificial substrate. Comparative analysis showed that the females caught in the lake largely avoid artificial substrate than females reared in a pond. This difference can be explained as the result of recent domestication. The density of eggs deposited on the artificial substrate that imitate the branches of aquatic plants is high enough to be used for the reproduction of the domesticated tench. The performed experiments show that for the industrial and ecological reproduction of the tench can be used the wild reproducers domesticated at least one year in the nursery ponds. Acknowledgment: The study was performed within the national project 15.817.02.27A