Determination of the spawning history of Pacific saury Cololabis saira from rearing experiments: identification of post-spawning fish from histological observations of ovarian arterioles
| Autor: | Satoshi Suyama, Sayoko Isu, Takashi Ichikawa, Toru Nakagawa, Hitomi Ozawa, Mitsuhiro Nakaya, Naoto Murakami, Akio Shimizu, Taizo Morioka, Yasuhiro Ueno |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Cololabis Victoria blue urogenital system 010604 marine biology & hydrobiology fungi 04 agricultural and veterinary sciences Aquatic Science Biology biology.organism_classification 01 natural sciences Fishery Pacific saury 040102 fisheries 0401 agriculture forestry and fisheries Fish reproductive and urinary physiology Histological examination |
| Zdroj: | Fisheries Science. 82:445-457 |
| ISSN: | 1444-2906 0919-9268 |
| Popis: | Rearing experiments under controlled temperature conditions were carried out to establish a methodology for estimating the spawning history of the Pacific saury Cololabis saira. The experiments involved histological examination of ovarian arterioles at various maturational stages. We found that pre-spawning immature fish lacked Victoria blue (VB)-positive arterioles in the ovaries, as did maturing fish, while post-spawning females had VB-positive arterioles. The latter were also observed after 6 months when most spawning activity had ceased. The results indicate that VB-positive ovarian arterioles are a characteristic feature of actively spawning Pacific saury and that females with VB-positive arterioles can be classified as post-spawning fish. Females without VB-positive arterioles can be regarded as “practically unspawned” fish, and this group may include some fish that have spawned a number of times, in addition to completely unspawned fish. The methodology has many practical uses such as in the estimation of maturation rates for stock management. |
| Databáze: | OpenAIRE |
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