이산화탄소 노출에 따른 두줄망둑(Tridentiger trigonocephalus)의 번식특성 변화
Changes in Reproductive Characteristics of Chameleon Goby Tridentiger trigonocephalus by Carbon Dioxide Exposure
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We investigated the effect of CO2 exposure on the reproductive process of chameleon goby Tridentiger trigonocephalus. Rearing aquaria were exposed for 90 days to CO2 gas through diffuser connected with pH controller maintaining at pH 7.2 (156.31±7.90 ppm) in low treatment, and at pH 6.5 (274.17±6.51 ppm) in high treatment. CO2 treatment had no significant effects on survival rates although the value was decreased compared to the controls. In female fish, CO2 treatment had no significant effects on gonadosomatic index (GSI), hepatosomatic index (HSI) and condition factor (CF). However, high CO2 treatment decreased HSI and CF in males significantly compared to the controls (P<0.05). The spawning occurrence was 6 times in the low level CO2 treatment, and 4 times in the high level CO2 treatment although only once in the controls. For the histological observations, there was no significant difference in CO2 treatments. However, in male fish, CO2 treatment delayed the formation of sperm from spermatid compared to controls. These results suggest CO2 may disrupt reproductive process by delaying gametogenesis in chameleon goby and it was more sensitive in males.
Abstract
We investigated the effect of CO2 exposure on the reproductive process of chameleon goby Tridentiger trigonocephalus. Rearing aquaria were exposed for 90 days to CO2 gas through diffuser connected with pH controller maintaining at pH 7.2 (156.31±7.90 ppm) in low treatment, and at pH 6.5 (274.17±6.51 ppm) in high treatment. CO2 treatment had no significant effects on survival rates although the value was decreased compared to the controls. In female fish, CO2 treatment had no significant effects on gonadosomatic index (GSI), hepatosomatic index (HSI) and condition factor (CF). However, high CO2 treatment decreased HSI and CF in males significantly compared to the controls (P<0.05). The spawning occurrence was 6 times in the low level CO2 treatment, and 4 times in the high level CO2 treatment although only once in the controls. For the histological observations, there was no significant difference in CO2 treatments. However, in male fish, CO2 treatment delayed the formation of sperm from spermatid compared to controls. These results suggest CO2 may disrupt reproductive process by delaying gametogenesis in chameleon goby and it was more sensitive in males.
참고문헌 (35)
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