Early development of nudibranch larvae (Gastropoda : Opisthobranchia) and the effect of salinity on growth and development in laboratory
1985
Suvarapron Chungyampin (Srinakharinwirot Univ., Bangsaen Campus, Chonburi (Thailand). Inst. of Marine Science)
Nudibranch deposited white ribbon-like egg masses, each one square millimetre of ribbon-like egg mass contain 45 - 52 egg capsules. Each egg capsule consists of one to eight eggs. Hatching period was 5 days (Laboratory temperature was approximately 29 deg C.). The average size of veliger larvae was 96 x 122 micro meter. The larvae were cultured in sterilized filtered sea water at a density of 5 larva/ml., fed with Isochrysis galbana at a density of 8 x 10(exp.4) cells/ml., and no treatment by antibiotics. Changing of sea water was made every three days. Eye spots were present on the veliger after hatching for 20 days, and the average size was 302 x 242 micro meter. The larvae was reared in different salinity, 12 - 45 ppt., 3 ppt. intervals. The high percentage of the growth rate of larvae were at 30,27,33,36 and 24 ppt., respectively. The salinity was not the important factor for growth and development of the larvae
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