Skip to Main content Skip to Navigation
Theses

Comparative approach of environmental determinism of the onset of the reproductive cycle of five temperate freshwater fish

Abstract : A way for the development of a sustainable inland aquaculture is the domestication of local species. As domestication usually results from a long, costly and empirical zootechnical process, the use of classifications could be a relevant strategy. In our laboratory, a generic method was developed based on grouping species sharing similar reproductive traits (29) and resulted in 10 clusters structured by spawning period and temperature of egg incubation. The aim of this work is to assess the relevance of this clustering by testing the effect of constant long (CP) and natural photoperiod (NP) on the onset of the reproductive cycle in “early spring” ESS (Eurasian perch, pikeperch, roach and pike) and a “late spring” spawner LSS (rudd). This work is based on a morpho-anatomic, histological and physiological analysis of the broodstock to study the effect of photoperiod treatments. Strong similarities were shown in the response of the ESS with inhibition of the reproductive cycle under CP and induction under NP. The gonadal development and the plasma levels of E2 and vitellogenin showed similar responses to the photoperiodic treatment between ESS, while, the androgens levels showed different responses even in species belonging to the same group and the same family. The observed similarities allow us to provide an evidence about the relevance of clusters especially for the most integrative parameters. However, even if extrapolation of current knowledge may be possible from Eurasian perch to other ESS especially for zootechnical purposes, the mechanisms of gonadogenesis regulation and especially androgenesis may be different between the studied species
Complete list of metadata

https://hal.univ-lorraine.fr/tel-01751294
Contributor : Thèses Ul <>
Submitted on : Thursday, March 29, 2018 - 1:15:16 PM
Last modification on : Thursday, January 7, 2021 - 3:46:00 PM

File

DDOC_T_2014_0265_BEN_AMMAR.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : tel-01751294, version 1

Citation

Imen Ben Ammar. Comparative approach of environmental determinism of the onset of the reproductive cycle of five temperate freshwater fish. Animal biology. Université de Lorraine, 2014. English. ⟨NNT : 2014LORR0265⟩. ⟨tel-01751294⟩

Share

Metrics

Record views

164

Files downloads

171