Light and electron microscopic identification and characterization of cells associated with goldfish scales were made with reference to their respective functions.The cells involved in the scale growth were classified into following four groups: small round cells surrounding the marginal osteoid zone, large flattened cells covering the calcifying osseous layer including those associated with the growth of ridges, cells found in the terminal of the groove, and cells forming laminae of the fibrillary plate.On the basis of their topography and fine structural characteristics, possible functions of the cells were discussed.A special attention was paid to the fine structure of the groove.The bottom wall of the groove was shown to be uncalcified and composed of randomly dispersed thick collagen fibers and of a densely packed substance.This feature supports the idea that it would give flexibility to the scale.
Aberrant sagittas of Theragra chalcogramma, Cleisthenes pinetorum herzensteini, and Salmo gairdnerii irideus are described.They are made up of abnormal portion where crystalline blocks of various sizes are piled up irregularly.The aberrant sagittas were found in either of the left or right sacculi, and in most cases those of the other side were normal.
A juvenile of scombrid fish of 219 mm in standard length was found in the stomach of a sailfish, Istiophorus platypterus (Shaw and Nodder), caught on longline gear in the waters of south east of Palau Is., approximately at 05°06'N, 136°20'E on Dec.6, 1966.Two other specimens of similar size to the former were found in the stomacn of a shortbill spearfish. Tetrapturus pfluegeri Robins and De Sylva, caught on longline off the Southwest Africa. approximately at 25°18'S, 05°09'E on Feb.8, 1966.These three specimens were identified with the slender tuna, Allothunnus fallai Serventy, basing upon the high number of gill rakers, slender body shape, and characters of axial skeleton. The occurrence from the waters off Palau Is.seems to be the first record of the species from the equatorial waters of the Pacific Ocean.
In the waters of Tsushima Island, young of dogtooth tuna, Gymnosarda unicolor (Riippell) which were gathered underneath the lurelamp were captured by squid fishing boats on 25 th July, 1970.Since then, the young were caught by surface trolling and set net, and the capture continued to early January 1971.Their size increased as season went on: 24.0-27.5 cm in fork length and 200-300g in body weight in early August;36.0-39.5cm in fork length and 640-910g in body weight in late November;41.0-45.0cm in fork length and 1115-1170g in body weight in the middle of January.But they have not been caught since January of: 1971. This species had been unknown among the fishermen working around Tsushima Island. This region is outside of their distribution area previously informed by some authors. Therefore, it is highly probable that the occurrence of this species is recorded in the first time here.
Young tunas referred to the genus Thunnus are one of the important resources in the waters of Tsushima Island, Nagasaki Pref., and commercial landings reach 400-1200 tons perannum.Their species name have not been decided, while two types, called in Japanese yokowa and hire-naga (or bin-naga) respectively, were known among fishermen.They were recognized as bluefin tuna T.thpnnus (Linnaeus) and longtail tuna T.tonggol (Meeker)