ON CHAETOGNATHS AND APPENDICULARIANS COLLECTED BY MR. Z. SAGARA IN THE ARAFURA SEA IN MAY-AUGUST 1955

Abstract

By courtesy of Mr. Z. SAGARA of the T6kai Regional Fisheries Research Laboratory, a chance was bestowed fortunately on me to examine fifty-five plankton samples collected by him in the Arafura Sea during his oceanographical observation in the period from the end of May to the beginning of August 1955. These samples were hauled by a modified HENSEN's net in miniature, 10 cm in diameter of the mouth, 25cm in the maximum diameter, 90cm in length and stretched with MULLER's gauze No.13 (ca. 130 meshes per square inch), from the bottom to the surface at stations shown in Chart 1. The situation of stations, date and time of each sampling and some other data concerning the water of the surveyed area are given at the end of this article, where the haul distance does not mean the depth at respective stations, because the rope may very often be stretched obliquely. Of these samples, chaetognaths and appendicularians were selected out and identified by myself, while other plankton organisms were submitted to respective specialists for their close examination. In the following, the results of my examination on the two animal groups are given in the form of tables, with some brief notes. Before going further I wish to express my hearty thanks to Mr. Z. SAGARA for his kindness.