Temperature effects on early
development and occurrence of metamorphosis-related morphological
abnormalities in hatchery-reared brown sole Pseudopleuronectes
herzensteini
M. Aritaki, T. Seikai-2004
Aquaculture, 240(1-4): 517-530
Abstract:
The objectives of the present study are to elucidate
the effects of rearing temperatures on early larval development and the
occurrence of metamorphosis-related morphological abnormalities in
hatchery-reared brown sole Pseudopleuronectes herzensteini. Newly
hatched larvae were reared through metamorphosis at different temperatures
(6, 9, 12, 15, 18, 21, and 24 °C). Growth and development of larvae were
accelerated concomitant with higher temperatures. Metamorphosed juveniles
were classified into four morphological categories as normal, pseudoalbinism
(two types), and ambicoloration, in combination with body color
(pigmentation) and eye location. Incidence of normal morphology was lowest
(11–24%) and that of pseudoalbinism was highest (74–83%) at 12 °C. The
highest incidence of normal morphology (51–73%) was obtained at 21 °C.
Although occurrence of ambicoloration was very low in all temperature
regimes (0–10%), it increased slightly with increasing temperatures.
Results of the present study strongly suggested that rearing temperature
during the larval period affected the appearance of normal fish because of
the different larval growth and development.
(Miyako Station, National Center for Stock
Enhancement, Fisheries Research Agency, Miyako, Iwate 027-0097, Japan,
e-mail: aritaki@affrc.go.jp)