Abolghasem, E.F., S. Majid, A. Naser, O. Hossein & M.A. Shima. (2011). Laboratory Culture of the Caspian Sea Calanoid Copepod Acartia clausi (Giesbrecht, 1889) at Different Salinity . World Journal of Fish and Marine Sciences. 3(6):590-599.

410380

Abolghasem, E.F., S. Majid, A. Naser, O. Hossein & M.A. Shima

2011

3(6):590-599.

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The Caspian Sea calanoid copepod, Acartia clausi, has good potential for mass culture as a live feed for mariculture. This study was carried out to investigate the effects of salinity on density of A. clausi at four salinities of 13, 20, 35 and 45 ‰ in 15 L carboys container and mass culture at two salinities of 13 and 35 ‰ in 100 L fiberglass culture tanks over a two weeks period. A. clausi was cultured at temperature 25-26 °C and fed with two algal diets including Isochrysis galbana and Chaetoceros calcitrans at food concentration 40×103 cells mLG1. Results showed that salinity had significant effects on density in 15 L container. With an initial stocking density of 5 adults LG1, maximum and minimum mean density reached to 435.13±75.05 and 103.96±12.56 individuals LG1 at salinities of 13 and 45 ‰ with significant (P$0.05) differences between treatments, respectively. Population density was not significant at 13 and 35 ‰ in 15 L containers (P#0.05). In 100 L tanks with an initial stocking density of 18-20 adults LG1, the mean density was not significant (P#0.05) at two salinities of 13 and 35 ‰. Total mean copepod production reached to densities of 1048.15±186.4 and 1402.26±270.7 individuals LG1 with the dominance of nauplius stages at salinities of 13 and 35 ‰, respectively. Maximum density was recorded 3437 individuals LG1 (3267 nauplii, 73 copepodites (C1-5) and 97 adults LG1) at salinity of 35 ‰. The results of this study recommended that A. clausi is a euryhaline species and can tolerate different salinities in culture conditions; however, it is better to be cultured at salinity of 35 ‰ for maximum population density growth.

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