Koga, F. (1960). The nauplius larvae of Centropages abdominalis Sato. Bulletin of the Japanese Society of Scientific Fisheries (= Nippon Suisan Gakkaishi). 26:877-881, figs. 1-3. (ix-1960, Japanese with English summary.).

94596

Koga, F.

1960

26:877-881, figs. 1-3. (ix-1960, Japanese with English summary.)

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Available in Wilson Copepod Library (non-digital)

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The Copepoda nauplii are herbivore, preyed by the larvae of Pisces, Crustacea, Sagittoidea the others which prey upon the nauplii. They may assume an important role in the food in the sea. Centyopages abdominalis SATOの ノ ー プ リ ア ス 幼 生* 古賀文洋 (1960年7月1日 受理) THE NAUPLIUS LARVAE OF CENTROPAGES ABDOMINALIS Fumihiro KOGA** SATO Centropages abdominalis SATO occurs usually in rather large numbers in January, in the western coast of Kyushu. In this season the plankton community is dominated by Ba- north cillariaceae, especially by Thalassiosira subtilis (OSTENFELD). In rearing the female specimens of C. abdominalis were placed in the jars filled with the water (C1--19.06). Skeletonema costatum (GREVILLE) and Stephanophixis palmeliana (GRE- VILLE) GRUNOw were placed in the jars for a fresh supply of the food or oxygen. The number of eggs produced by C. abdominalis ranged from 120 to 130 with an average of 122 eggs per brood. The egg is semitranslucent with light green in colour. The pelagic egg is 0.075mm in diameter having many setae on the surface. The length of the setae is from 0.02 mm to 0.04 mm. The egg is very similar to Haliocladus (Radiolaria) in structure. The nauplius is pyriform, and slight pointed posteriorly and quite rounded anteriorly. The nauplius retains red brown in the posterior region. The dark red eye-spot is compara- tively large at the proximal portion of the rostrum. The nauplius is very similar in struc- ture to that nauplius of Centropages hamatus (LILLJEBORG) described by M. OBERG (1906). After hatching, the larva developed into the nauplius VI which is the final stage of nauplius within about 10 days at the water temperature 15.4•ZC.

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