フイロゾマ幼生に関する海洋生物学的研究

• Main Author: 税所 俊郎
• Format: Report
• Language: Japanese
• Published: 鹿児島大学
• Subjects: 660; Indian; Antarc*; antarcticus
• Online Access: http://hdl.handle.net/10232/13843; https://ir.kagoshima-u.ac.jp/?action=repository_uri&item_id=7882; https://ir.kagoshima-u.ac.jp/?action=repository_action_common_download&item_id=7882&item_no=1&attribute_id=16&file_no=1

The studies on the phyllosoma larvae of Palinulid and Scyllarid lobster, crustacean decapod, have been made from various points of view, but their larval development, migration in the sea, and the way how to return for recruitment to their habitat from off-sea, are still left to further research. The purpose of the present paper is to study the phyllosoma larvae, reared or collected, in connection with oceanographic conditions that surrounds them. 1. On the rearing of phyllosoma larva. (1) Phyllosoma of genus Panulirus. As to Panulirus phyllosoma Panulius japonicas, the Japanese spiny lobster, was mainly used. In author’s experiments, 12 times moulted larva (13th instar), 6.4 mm in length, was obtained, though the attempt to rear up the Puerulus larva was not successful. The suitable water temperature for phyllosoma is 22°-29°C. For their food were used the nauplii of brine-shrimps. The growth of cultured phyllosoma was nearly constant till 5th instar, and after that it became dull gradually. From these results, it may reasonably be assumed that the growth from 6th till 13th instar is abnormal in some degree. Each ecdyses of Phyllosoma occurs at almost regular intervals, which are apt to widen gradually, and the interval is short at first (7-8 days) and later it becomes gradually prolonged (10-15days). These intervals shows ome fluctuations when their food is changed in quality or in quantity. Usually the intervals become shorter when more or better food is given. (2) Phyllosomas excepting genus Panulirus. The rearing up of phyllosoma of Ibacus ciliates to 4th instar, that of Parribacus antarcticus to 3rd instar and that of Scyllarus bicuspidatus to 9th instar were brought forth successfully. The condition of breeding is nearly the same with Panulirus phyllosoma. 2. On the distribution of phyllosoma in the Indian Ocean. In 1963-64, Kagoshima-maru, attached to the Kagoshima University, engaged in the International Indian Ocean Expedition, carrying on the plankton investigations at the areas of 7°N~26°S and ...