Individually specific
seasonal cycles of embryonic development in cultured broodstock females of
the black rockfish, Sebastes schlegeli
M. Nakagawa, K. Hirose-2001
Aquaculture, 233(1-4): 549-559
Abstract:
Viviparous black rockfish, Sebastes schlegeli,
mate in November, fertilization occurs in the following April and birth of
larvae in May at the Miyako Station of the Japan Sea-Farming Association
(JASFA). Developmental stages of intra-ovarian embryos in individual female
black rockfish reared in an indoor tank were examined using a cannulation
method on almost the same day (April 24 or 25) for three successive years.
The estimated delivery occurred near the predicted date regardless of the
year. This indicates that black rockfish have individually specific annual
cycle of fertilization and embryonic development. Understanding individual
annual cycles of parturition is very useful for efficient broodstock
management and juvenile production for aquaculture and stock enhancement.
(Miyako Station, Japan Sea-Farming Association, Sakiyama, Miyako, Iwate
027-0097, Japan, e-mail of M. Nakagawa: masahiro-nakagawa@jasfa.or.jp)