Pakistan Research Repository

DISTRIBUTION OF PENAEID LARVAE IN THE COASTAL WATERS OF PAKISTAN

Habib, -Ul-Hassan (1983) DISTRIBUTION OF PENAEID LARVAE IN THE COASTAL WATERS OF PAKISTAN. PhD thesis, University of Karachi, Karachi.

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Abstract

The material for three years study of distribution and abundance of penaeid eggs, larvae and postlarvae in Manora Channel and Korangi Creek was obtained through regular sampling (three to four times in a month) in the two areas. In Manora Channel 399 eggs and 5639 larvae were caught in 74 positive hauls and in Korangi Creek 1339 eggs and 5496 larvae were caught in 235 positive bauls. The larvae were identified to genus level. Parapenae-opsis larvae were the most abundant while Metapenaeus and Penaeus larvae were second and totally absent from the samples. The larvae belonging to other than the above mentioned three commercial genera were scarce. In the two inlets the eggs appeared in significant numbers only during January to March, while larvae abundant in the summer months The distribution and abundance of penaeid eggs, larvae and postarvae were studied in the coastal waters of Pakistan through samples colleted during R/V, Dr. Fridt-jof Nansen curises (January to June 1977). A total of 3761 penaeid eggs and 1072 penaeid larvae were taken in 87 positive surface hauls. 1145 penaeid eggs and 161 penaeid larvae were caught in 31 positive oblique hauls. The most productive area in respect of penaeid eggs, larvae and postlarvae was located inbetween Ormara and Indus Delta. Penaeid eggs were most abundant in the coastal waters of Pakistan in January-February and gradually decreased in number towards June. They were more abundant in the off-shore than in the inshore waters. The larvae were found distributed more closely to the coast. The larvae were identified to genus level. Parapenaeopsis larvae dominated in abundance, while Metapenaeus and Penaeus larvae were second and third in abundance. The postlarvae of Parapenaeopsis were absent from the samples. The larvae belonging to genera other than mentioned above were scarce The distribution and abundance of penaeid Juveniles were studied in Korangi Creek, Bhambore, Sandspit and Hab Delta for one year, through monthly sampling with a specially designed beam trawl. Size frequency distribution and abundance of Juveniles of M. stebbingi, M. affinis, M. monoceros and Penaeus spp. Are given. Growth rates of P. semisulcatus and above mentioned species are included. Parapenaeopsis Juveniles were found absent from the samples The hydrography of the areas mentioned above is included. Abundance of eggs, larvae, postlarvae and Juveniles in relation to hydrographic conditions, spawning seasons and spawning grounds, recruitment of appearance of subadults and adult shrimps in the commercial fishing grounds is discussed.

Item Type:Thesis (PhD)
Uncontrolled Keywords:penaeid larvae, penaeid eggs, larvae, postlarvae, parapenae-opsis, metapenaeus, penaeus, coastal waters
Subjects:Biological & Medical Sciences (c) > Biological Sciences(c1) > Biology (c13)
ID Code:1193
Deposited By:Mr. Muhammad Asif
Deposited On:03 Jan 2007
Last Modified:04 Oct 2007 21:05

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