Spawning induction and rearing of larvae of tridacnid clams (Bivalvia; Tridacnidae)
1981
Gwyther, J. | Munro, J.L. (Papua New Guinea Univ. (Papua New Guinea). Dept. of Biology)
A new, reliable method of inducing spawning in Tridacna maxima, using freeze-dried gonad is described. A direct induction technique useful for underwater work is also presented. The effect of food supply on larval growth and metamorphosis was investigated and larval growth in the absence of particulate food is discussed. It is suggested that inclusions visible in the larval velum are symbiotic algae, which must have been acquired at the egg stage either before or during extrusion of eggs from the adult. The role of dissolved organic matter in larval nutrition is dicussed. Settlement of pediveligers onto plastic panels was tested, and the substrate found to be acceptable to larvae as well as convenient for the culturist. Methods to improve juvenile survival are suggested
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