Embryonic development and larvae of long shanny, Stichaeus grigorjewi Herzenstein
1990
Kyushin, K. (Hokkaido Univ., Hakodate (Japan). Faculty of Fisheries)
Although long shanny, Stichaeus grigoriewi, is a common blennioid fish found in Hokkaido waters and is available commercially, no research on its life history has been conducted. The present study describes the embryonic and larval development of the species observed in a rearing experiment. Eggs and larvae were reared under an average water temperature of 6.1 degrees C and 8.5 degrees C respectively. Eggs were spherical, demersal and adhesive, measuring 1.25 mm in average diameter. The fertilized eggs underwent the typical discoidal cleavage as in other teleost egg. On the 33rd day after insemination, hatching occurred and continued for a week. The hatching rate was as high as 86 percent. The average total body length of the newly hatched larvae was 7.99 mm with 60 to 63 myotomes. Larval mortality increased from the 8th day after hatching and all larvae starved to death by the 13th day, even though nauplii of Artemia salina were supplied amply. The average survival time of the larvae was 8.7 days but the growth in total length was only 0.34 mm
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