NDLI: Effects of water temperature on early development of Japanese eel Anguilla japonica

Content Provider	Springer Nature Link
Author	Okamura, Akihiro Yamada, Yoshiaki Horie, Noriyuki Utoh, Tomoko Mikawa, Naomi Tanaka, Satoru Tsukamoto, Katsumi
Copyright Year	2007
Abstract	To determine an optimal temperature range for efficient production of healthy eel larvae Anguilla japonica, the effect of water temperature on hatching, survival, and deformity rates was examined. The early ontogeny of morphological features in this species by incubating eggs at five different temperatures (19, 22, 25, 28 and 31 °C) was examined. Hatching occurred at 24, 28, 46 and 58 h after fertilization when incubated at 28, 25, 22 and 19°C, respectively; no eggs hatched at 31°C The growth rate of prefeeding larvae increased as water temperature was elevated and acquisition of feeding ability was also accelerated at higher temperature. Significantly high hatching rates (76–86°, P<0.05) and survival rates (61–86%, P<0.05) were observed at relatively high temperatures (22–28°C). The deformities were ‘open lower jaw’, ‘pericardial edema’, and ‘notochordal bending’, in which the mouth was deformed with a downward projecting lower jaw, the pericardial cavity was swollen, and the notochord was bent or twisted to various degrees, respectively. Open lower jaw and pericardial edema were especially predominant at 19°C, with rates of 68 and 92%, respectively, compared with 31 and 10% at 25 and 28°C, respectively. The occurrence of notochordal bending was not affected by temperature. The optimal temperature for incubation and rearing A. japonica eggs and prefeeding larvae is approximately 25–28°C.
Starting Page	1241
Ending Page	1248
Page Count	8
File Format	PDF
ISSN	09199268
Journal	Fisheries Science
Volume Number	73
Issue Number	6
e-ISSN	14442906
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-01-01
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	abnormality Gompertz growth curve hatchability Japanese eel leptocephalus ontogeny survival water temperature Fish & Wildlife Biology & Management Freshwater & Marine Ecology Food Science
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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