SCA 10
BARON, J., DITER, A. and A. BODOY
Triploidy induction in the black scallop (Chlamys varia L.) and
its effect on larval growth and survival.
1989 9 pp
Aquaculture, 77, 103–111
Triploid scallops (Chlamys varia L.) were produced by treating newly fertilized eggs with cytochalasin B. An exposure of 15 min was applied 10, 20 and 30 min after fertilization. The best results were obtained for a delay of 20 min, both in terms of triploid percentage (78.5%) and 24-h survival (87.5%). Triploidy was detected by karyological examinations of embryos. A karyotype is given for the species. Growth and mortality were compared during larval development for untreated diploid controls and for triploids. No significant difference was found for growth in length, whereas mortality was significantly higher for the triploids, before metamorphosis.
SCA 11
MALACHOWSKI, M.
The reproductive cycle of the rock scallop, Hinnites giganteus
(Grey) in Humboldt Bay, California.
1988 8 pp
Journal of Shellfish Research, Vol. 7, No. 3, 341–348
The annual reproductive cycle of the rock scallop, Hinnites giganteus (Grey) from Humboldt Bay, Northern California, was examined. Rock scallops were collected at 3–6 weeks intervals between June 1984 and June 1985 and histological sections of the gonad were made. A poorly defined annual spawning cycle was observed. Scallops were in the active or ripe stages throughout most of the year. Induced spawning, attempted at 3–6 weeks intervals by injecting serotonin into the gonad, was successful in both sexes every month but November 1984 and January and February 1985.
