Nippon Suisan Gakkaishi 76 (5), 894-904 (2010)

Morphological development, organogenesis and somatic growth of hatchery-reared nigorobuna Carassius auratus grandoculis

KOH-ICHI FUJIWARAa*

Shiga Prefecture Fisheries Experiment Station, Hikone, Shiga 522-0057, Japan

The morphological development, organogenesis and somatic growth of hatchery-reared nigorobuna Carassius auratus grandoculis from newly-hatched larvae to early stage of juveniles were investigated in order to obtain basic data for determining the effective size at release for the stock enhancement program in Lake Biwa. As a result, generally the completion of the fin rays, scales and skeleton, and rapid development of the skeletal muscles and organs for digestion, respiration, circulation, hematogenesis, excretion and sensory perception were observed at the juvenile stage of approximately 16 mm in standard length (SL), leading to an improved ability to survive under natural environmental conditions. It was concluded that this developmental stage (ca. 16 mm SL) is a criterion for determining the effective size at release.


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