Abstract
The process of gonadal development and differentiation of large yellow croaker Larimichthys crocea was investigated with histological methods.The sampled fries were hatched on Sept.22,2009 at 26 ℃.The temperature for nursery and culture were 22.0-25.8 ℃ and 11.5-25.6 ℃,respectively.At the age of 20 days post hatch(dph),when the fries gained 17.6-19.2 mm in body length(BL),a pair of primordial gonads were present in the abdominal cavity.Ovarian differentiation occurred at 55 dph(BL 27.5 37.0 mm),and was characterized by the presence of clusters of oogonia.The formation of ovarian cavity and meiosis of germ cells began simultaneously at the age of 60dph(BL 28.0-37.2 mm).The presence of primary oocytes occurred at the age of 120 dph(BL 39.2-51.0 mm).The differentiation of testis began at the age of 95 dph(BL 38.0-48.0 mm) and was characterized by the presence of efferent duct and the scattering of somatic cells throughout the gonad.Cyst of spermatocytes could be seen at 215 dph(BL 44.0-59.2 mm) and testis lobules started to form at 230 dph(BL 56.2-72.8 mm).These results suggested that large yellow croaker is a differentiated gonochorist,and differentiation of the ovary occurs earlier than that of testis.
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