نویسندگان
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Reproduction period, spawning peak and sexual maturity in anchovy kilka were
investigated during the year 2006 for sustainable yield assessment in Iranian waters of the
Caspian Sea. The mean fork length, total weight and age were 118±5.9mm, 11±1.7g and
4.6±1.2 year, respectively. Mean (±SD) absolute fecundity was 12625±5533 ovules. More
than 50 percent of the fish specimens matured when their length exceeded 92.5mm. The
results showed that reproduction of anchovy kilka occurred in autumn, and spawning occurred
throughout the year and especially in winter. The length and age ranges were found to be
shortened compared to the past years with many older fish and less younger ones (< 2 years)
in the catch which sharply decreased recruitment. This phenomenon is thought to be due to
overfishing synchronized with invasion of M. leidyi pushing kilka to spawn in winter, which
all cause collapse of anchovy kilka stocks in the Caspian Sea. We postulate that anchovy kilka
has adopted the strategy of spawning year round to mitigate the negative effects of
overfishing and invasion of M. leidyi.
*Corresponding author
کلیدواژهها [English]
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