Comparative study of the reproductive strategy in the roach (Rutilus rutilus L.) and in the gudgeon (Gobio gobio L.) under controlled temperature conditions
Keywords:
stress, temperature, hormone, reproduction, cyprinidAbstract
The effect of controlled cooling on the oogenesis dynamic in a group-synchronous (roach) and an asynchronous (gudgeon) fish was studied. The levels of plasma steroid hormones [testosterone (T), estradiol-17 β (E2) and 17âˆÂ, 20 β-dihydroxyprogesterone (17âˆÂ,20 β-P)] were estimated and associated with the stage of oocyte maturity of each fish. In the roach, the mean levels of plasma steroid hormones were very low, the extremes were respectively: 0.29-0.58 ng/mL; 0.16-0.32 ng/mL and 1.28-11.27 ng/mL. The assessment of gonad development of the examined fish revealed that these ones were strongly affected by pre-ovulatory atresia. In the gudgeon the E2 levels (0.05 to 1.23 ng/mL) were present during the whole experiment, showing a prolonged vitellogenic activity. The T concentrations (0.99 to 2.10 ng/mL) follows rather well the E2 profile. The 17âˆÂ,20 β-P presented a progressive and opposite evolution to E2 profile. Peaks of 17âˆÂ,20 β-P related to temperature changes were monitored, but they were quite low, between 0.66 and 4.41 ng/mL. The histology of the gonads showed a great individual variation, some females had a lot of vitellogenic oocytes, some had already spawned, others were preparing another spawning and others were in a recuperation phase.
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