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Theses

Déterminisme de la qualité du cycle de reproduction chez la perche commune, Perca fluviatilis : approche multifactorielle

Abstract : Numerous environmental, nutritionnal and populationnal factors are likely to be involved in the quality of reproduction in fish. The objective of this PhD study was to determine and ranking the importance of the effects of these factors and their interactions on the determinism of the quality of reproduction in Eurasian perch, Perca fluviatilis. A first factorial experiment aimed at identifying the factors acting of the induction of the reproductive cycle. 8 two-levels factors were tested (amplitude of temperature decrease, timing, kinetics and amplitude of photoperiod decrease, handling, initial nutritional state, feeding and light spectrum). It was confirmed that temperature and photoperiod decreases are the two main cues inducing the reproductive cycle. Handling stress appears to be the most important factor modulating vitellogenesis. A second factorial experiment testing 8 two-levels factors (temperature, nutritional state, handling, dawn, light intensity, food type, feeding and photoperiod) dealt with the quality of reproduction (sperm, eggs and broodstock mortality). No spawning was obtained. This suggests that the photothermal program of control of the reproductive cycle could be inadequate. Sperm quality appears to be mainly affected by nutritional state and light intensity. High mortalities were observed and their determinism could be complex. A first qualitative model of the determinism of the quality of reproduction is proposed.
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Theses
File URL :
http://docnum.univ-lorraine.fr/prive/SCD_T_2006_0120_WANG.pdf
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https://hal.univ-lorraine.fr/tel-01746553
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Submitted on : Thursday, March 29, 2018 - 10:40:10 AM
Last modification on : Friday, February 5, 2021 - 3:43:04 AM

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  • HAL Id : tel-01746553, version 1

Citation

Neil Wang. Déterminisme de la qualité du cycle de reproduction chez la perche commune, Perca fluviatilis : approche multifactorielle. Autre. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10120⟩. ⟨tel-01746553⟩

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