Combined effects of temperature and salinity on embryos and larvae of the northern bay scallopArgopecten irradians irradians

✍ Scribed by S. T. Tettelbach; E. W. Rhodes

• Publisher: Springer-Verlag
• Year: 1981
• Tongue: English
• Weight: 819 KB
• Volume: 63
• Category: Article
• ISSN: 0025-3162
• DOI: 10.1007/bf00395994

✦ Synopsis

The combined effects of temperature and salinity on embryonic development and on larval survival and growth to setting size of the northem bay scallop Argopecten irradians irraclians (Lamarck) were studied in the laboratory. A 6 x 6 complete factorial design was used; temperatures ranged from 10 ~ to 35~ at 5 C ~ intervals, and salinities ranged from 10 to 35% oS, at 5~ intervals. Response-surface contour diagrams were generated to provide estimates of conditions for optimal responses. Normal development of embryos oocurred over a very narrow range of temperature and salinity. Survival of larvae occurred over a wider range of temperature and salinity than did embryonic development or growth of larvae. Satisfactory growth (>70% of the maximum observed value) occurred only at high temperature-high salinity conditions; optimal conditions for survival occurred at similar salinities, but at slightly lower temperatures. Temperatures of 35 ~ or greater and/or salinities of 10~176 or less were lethal for all life stages studied. Both salinity and temperature exerted significant effects on development and survival, but temperature was clearly the dominant factor influencing growth. It is suggested that northern bay scallop embryos and larvae be reared at their respective optimal temperature-salinity levels so as to increase efficiency of aquaculture operations.