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The type of spawning agent affects the egg composition during out-of-season spawning but not during in-season spawning in Eurasian perch, Perca fluviatilis.

Abstract：

:The aim of the study was to verify the effect of various hormonal agents [human chorionic gonadotropin (hCG) and salmon gonadoliberine analogue (sGnRHa)] applied at different stages of maturity of the females [out-of-season (maturation stage I) and in-season spawning (maturation stages II and IV)] on the proximate composition (PC) and fatty acid (FA) profile of eggs of Eurasian perch, Perca fluviatilis. The egg samples (7 samples from each group) were also collected from spontaneous spawning (without hormonal treatment) fish representing each maturation stage (I, II and IV for groups C-I, C-II and C-IV, respectively). The results were also compared with the eggs collected in nature (seven randomly chosen egg samples from natural spawning; group NS). Embryonic survival rate was recorded and analysis of PC and FA profile were performed, for all the groups. Embryonic survival rate varied among the groups, and only differences (P<0.05) between group C-I and NS were recorded. In-season spawning operation did not affect PC and FA profiles. Application of hCG or spontaneous spawning (group C-I) were found to have the highest effect on the FA profile. It concerned mostly total n-3 polyunsaturated fatty acids, but also stearic (C18:0), oleic [C18:1(cis9)], linoleic [C18:2(n-6)], arachidonic [C20:4(n-6)] and docosahexaenoic[C22:6(n-3)] acids. The application of sGnRHa during out-of-season spawning had the lowest effect on the FA profile. The results presented indicate that controlled reproduction can affect the FA profile only during out-of-season spawning. This negative effect can be presumably compensated by the application of sGnRHa as a spawning agent.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Żarski D,Palińska-Żarska K,Łuczyńska J,Krejszeff S

doi

10.1016/j.ygcen.2016.04.027

subject

Has Abstract

pub_date

2017-05-01 00:00:00

pages

19-29

eissn

0016-6480

issn

1095-6840

pii

S0016-6480(16)30109-5

journal_volume

245

pub_type

临床试验,杂志文章

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