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Free Content Laboratory Rearing of the Larvae of the Mahogany Date Mussel Lithophaga Bisulcata

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Although adults of Lithophaga bisulcata did not spawn readily in the laboratory, fertilized eggs were obtained after six adventitious spawnings of captive adults. Larvae, developing from these eggs, were reared through pelagic stages in the laboratory. Eggs were 64µ in diameter, the gastrula 66µ long, and the trochophore 67µ × 57µ. Shelled stages increased in length from 92µ to 400µ during pelagic development, and a broad umbo appeared when larvae were between 140µ and 160µ long. The hinge structure of the larval shell consisted of a series of taxodont teeth at either end of the hinge line. Shelled larva did not possss an apical flagellum.

Trochophores and straight-hinge larvae appeared positively phototactic. Pediveligers developed large eyespots and were able to delay metamorphosis for at least one month. Larvae resembled larvae of Modiolus demissus much more than those of Mytilus edulis, but had a broader umbo and more rounded ventral margin. Also, in older larvae of L. bisulcata, the umbo appeared to shift anteriorly from the midline.

Document Type: Research Article

Publication date: June 1, 1971

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