Two spawning stocks of icefish Neosalanx taihuensis revealed from annual reproductive cycle analyses

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...

Full description

Bibliographic Details
Published in:Fisheries Science
Main Authors: Gong, Wang Bao, Li, Hong Tao, Xie, Shou Qi, Liu, Jia Shou, Murphy, Brian R., Xie, Song Guang, Xie, SG, Chinese Acad Sci, Key Lab Biodivers & Conservat Aquat Organisms, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China
Format: Article in Journal/Newspaper
Language:English
Published: 2009
Subjects:
Annual Reproductive Cycle
Neosalanx Taihuensis
Spawning Stocks
Tian-e-zhou Oxbow
Yangtze River
Fisheries
Science & Technology
Life Sciences & Biomedicine
ANCHOVY ENGRAULIS-JAPONICUS
GASTEROSTEUS-ACULEATUS
XUJIAHE RESERVOIR
CENTRAL CHINA
LIFE-HISTORY
POPULATION
SALANGIDAE
FISH
SEA
AVAILABILITY
Icefish
Online Access:http://ir.ihb.ac.cn/handle/152342/7588
https://doi.org/10.1007/s12562-009-0145-6
Description
Summary: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. 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.

Similar Items