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Effects of salinity on egg and fecal pellet production, development and survival, adult sex ratio and total life span in the calanoid copepod, A cartia tonsa:a laboratory study

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Chinese Journal of Oceanology and Limnology 2016年第4期34卷 709-718页

作者： SHAYEGAN Majid esmaeili fereidouni abolghasem AGH Naser JANI KHALILI Khosrow MSc.Student Faculty of Animal Sciences and Fisheries Sari Agricultural Sciences and Natural Resources University (SANRU) Fisheries Department Faculty of Animal Sciences and Fisheries Sari Agricultural Sciences and Natural Resources University (SANRU) Artemia Reference Center Urmia University

The ef fects of salinity on the copepod, A cartia tonsa in terms of daily egg production rate(EPR), hatching success, fecal pellet production rate(FPR), naupliar development time and survival, sex ratio, and total life span were determined in laboratory conditions through three experiments. In experiment 1, EPR, hatching success, and FPR of individual females were monitored at salinities of 13, 20, 35 and 45 during short-periods(seven consecutive days). Results show EPR was aff ected by salinity with the highest outputs recorded at 20 and 35, respectively, which were considerably higher than those at 13 and 45. Mean FPR was also higher in 35 and 20. In experiment 2, the same parameters were evaluated over total life span of females(long-term study). The best EPR and FPR were observed in 35, which was statistically higher than at 13 and 20. In experiment 3, survival rates of early nauplii until adult stage were lowest at a salinity of 13. The development time increased with increasing of salinity. Female percentage clearly decreased with increasing salinity. Higher female percentages(56.7% and 52.2%, respectively) were signifi cantly observed at two salinities of 13 and 20 compared to that at 35(25%). Total longevity of females was not af fected by salinity increment. Based on our results, for mass culture we recommend that a salinity of 35 be adopted due to higher reproductive performances, better feeding, and faster development of A. tonsa.

关键词：实验室条件桡足类产蛋率生产率盐度寿命粪便孵化成功率

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