ズワイガニに関する漁業生物学的研究-I : プレゾエア幼生について

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Prezoea of Chionoecetes opilio and its molting process were described. The egg-bearing females were captured by means of a dragnet from 250-300 meters depth of Wakasa-Bay in February of 1966, and were kept in laboratory tanks until the eggs hatched out. The larva just after hatching is prezoea covered with a embryonic curticle. There are no spines on carapace. First antenna is tipped by a long and a short plumose setae. Second antenna has a short process and an exopod bearing 4 plumose setae of each side. The telson is bifurcated posteriarly and has seven spines on each side. The first and the fourth spines from the outside are smooth, while the rest of the spines are plumose. The fourth spine is very small. Soon after the hatching the prezoea began to molt. The exuviation proceeded is the following order; unfolding of the maxillipedes, flick up of lateral and dorsal spines, molting of cephalothorax, first, second antenna and maxillipedes, streching out of the rostral spine and the spinous process, molting of the abdomen and telson.
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