Abstract
Mature male flagfish Jordanella floridae were continuously exposed to lake water with depressed pH levels of 6.0, 5.5, 5.0 and 4.5 during a 20 day period at 25°C. Quantitative histological analysis based upon the final stage of spermatogenesis prior to sperm formation indicated that the production of mature sperm was reduced at all pH values tested by 24.03, 27.03, 37.28 and 35.29% respectively when compared with the control at pH 6.7. Total volume of reproductive tissue relative to somatic tissue within the testes showed similar declines of 24.64, 25.39, 24.81 and 38.50% respectively compared to the control. The general decline in spermatogenesis was confirmed morphologically by increased occurrence of tubules devoid of sperm and was particularly evident at pH 4.5. Comparison of the present results with data from female ovaries of the same experiment suggests a higher sensitivity of developing eggs to declining pH when compared with developing sperm.
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