Seasonal Development of Gonads of the Hagfish, Eptatretus burgeri, Correlated with Their Seasonal Migration

摘要: Abstract Seasonal development of gonads was studied in the hagfish, Eptatretus burgeri, caught near Misaki Marine Biological Station facing Sagami Bay Pacific coast Japan, during periods from October 1971 to March 1973 and November 1977 December 1978. The hagfish were collected at water depths 6 10 m (shallow water) Koajiro close or 50 100 (deep water), about 1,600 4.800 west Station. They monthly both shallow deep waters, but they could not be warmer summer months (July-September) due seasonal migration. mean total lengths females waters January April 40.7± 0.4 cm (± SEM; n=317) 34.5± 0.3 n=556), respectively. In locations, developing eggs longer than 5 mm found larger 39 length. There no difference annual growth curves developin...