Effect of the Ctenophore invasion and adjust project of floating in the Trend of change of Kylka (Clupeidae) fishing in Iranian Coasts of the Caspian Sea (1999- 2009)
Subject Areas : New Technologies in Aquaculture Development
Keywords: Caspian Sea, Mnemiopsis leidyi, Keywords: Kylka fishes, Fisheries management,
Abstract :
Abstarct Mnemiopsis Leidyi (Ctenophora), is the naïve of Atlantic coast (North and South America). The appearance of this kind of pectinated animals was reported at once in 2008 in the southern coasts of Caspian Sea that was entered via Black sea from its motherland by balance water of ships. Intense reduction of Kylka stocks, sturgeons and Caspian seal in the Caspian Sea is associated with the widespread distribution of these Ctenophora. According to authorized Kylka fishing, just increasing of the number of vessels and their fishing are not sufficient reasons for reducing of kylka stocks, but this factor with invasion and presence of the ctenophore in the years of 1998 to 2009 are caused the reduction of the amount of Kylka stocks and fishing. Subsequent to this reduction, from 2003, the mitigation plan of vessel number and natural restoring of the sea too, fishing of Kylka has improved so that in the end of February 2009 in comparing to 2008 has been increased 68% than in 2008.
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