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- Title
Two spawning stocks of icefish Neosalanx taihuensis revealed from annual reproductive cycle analyses.
- Authors
Wang Bao Gong; Hong Tao Li; Shou Qi Xie; Jia Shou Liu; Murphy, Brian R.; Song Guang Xie
- Abstract
Neosalanx taihuensis were sampled from the Tian-e-zhou Oxbow from March 2006 through November 2007. Two separate spawning seasons were identified based on the annual reproductive cycles of the females, designated as the autumn-spawning season and the spring-spawning season. Lifespan of the offspring of the spring-spawning fish was 1 year, with them dying after the subsequent spring spawning. Autumn-spawned females seem to be the offspring of the spring-spawning fish, based on monthly changes in the length–frequency distributions. Spring-mature females had higher absolute fecundity, gonadosomatic index, and relative condition factor in 2007 than in 2006. Relative condition factor of the immature female offspring of spring-spawning fish was higher in 2007 than in 2006, portending a further increase in reproductive investment during the spring spawning of 2008. The increasing reproductive investment suggests that the population of N. taihuensis in the Tian-e-zhou Oxbow may be recovering from its recent decline.
- Subjects
SPAWNING; PATAGONIAN toothfish; FERTILITY; FISH fertility; FERTILIZATION (Biology)
- Publication
Fisheries Science, 2009, Vol 75, Issue 5, p1157
- ISSN
0919-9268
- Publication type
Article
- DOI
10.1007/s12562-009-0145-6