Influence of artificial fertilization methods of the hormone-treated Japanese eel Anguilla japonica upon the quality of eggs and larvae (comparison between stripping-insemination and spontaneous spawning methods)
-
Published source details
Horie N., Utoh T., Mikawa N., Yamada Y., Okamura A., Tanaka S. & Tsukamoto K. (2008) Influence of artificial fertilization methods of the hormone-treated Japanese eel Anguilla japonica upon the quality of eggs and larvae (comparison between stripping-insemination and spontaneous spawning methods). Nippon Suisan Gakkaishi (Japanese edition), 74, 26-35.
Published source details Horie N., Utoh T., Mikawa N., Yamada Y., Okamura A., Tanaka S. & Tsukamoto K. (2008) Influence of artificial fertilization methods of the hormone-treated Japanese eel Anguilla japonica upon the quality of eggs and larvae (comparison between stripping-insemination and spontaneous spawning methods). Nippon Suisan Gakkaishi (Japanese edition), 74, 26-35.
Actions
This study is summarised as evidence for the following.
| Action | Category | |
|---|---|---|
|
Breed eels in captivity Action Link |
 |
-
Breed eels in captivity
A replicated study in 2006 at a research facility in Japan (Horie et al. 2008) found that Japanese eel Anguilla japonica eggs and larvae produced from spontaneous spawning and fertilization had higher fertilization, hatching and survival rates, and lower deformity rates, compared to eggs and larvae produced from manual egg extraction and fertilization. On average, eggs and larvae produced from spontaneous spawning and fertilization had higher fertilization (80%), hatching (62%) and survival rates (54%), and lower deformity rates (60%), than those produced from manual egg extraction and fertilization (fertilization = 41%, hatching = 31%, survival = 27%, deformity = 79%). In March–June 2006, eel eggs were produced from spontaneous spawning and fertilization in one experimental group (each of 12 ovulating females placed in a tank with three males releasing sperm), and from manual egg extraction and fertilization in another (eggs manually extracted from each of 15 ovulated females and inseminated with stored sperm). Female eels were wild-caught and captive-reared. Male eels were sourced from farms. Hormones were used to induce maturation, ovulation and sperm production. Samples of fertilized eggs from both groups were reared in microplates (three samples/female/treatment). Fertilization rates were estimated after 4 h, hatching rates after 28 h, and larvae survival and deformity rates after five days.
(Summarised by: Anna Berthinussen)
