I= DISTRIBUTION OF PENAEID LARVAE IN THE COASTAL WATERS OF PAKISTAN
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Title of Thesis
DISTRIBUTION OF PENAEID LARVAE IN THE COASTAL WATERS OF PAKISTAN

Author(s)
Habib-Ul-Hassan
Institute/University/Department Details
University of Karachi/ Centre of excellence in Marine Biology
Session
1983
Subject
Marine Biology
Number of Pages
288
Keywords (Extracted from title, table of contents and abstract of thesis)
penaeid larvae, penaeid eggs, larvae, postlarvae, parapenae-opsis, metapenaeus, penaeus, coastal waters

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.

Download Full Thesis
1786.74 KB
S. No. Chapter Title of the Chapters Page Size (KB)
1 0 Contents 0
131.59 KB
2 1 General Introduction 1
59.97 KB
3 2 Review Of Earlier Work 7
59.64 KB
4 3 Material And Methods 13
88.09 KB
  3.1 Sampling For Penaeid Eggs, Larvae And Postlarvae In Manora Channel And Korangi Creek 13
  3.2 Sampling Of Penaeid Eggs, Larvae And Postlarvae From The Northern Arabian Sea Of The Coast Of Pakistan 14
  3.3 Sampling For Juveniles Of Penaeids In The Backwaters And Creeks Around Karachi 15
  3.4 Identification Of Eggs, Larvae, Postlarvae And Juveniles Of Penaeids Of Pakistani Waters 17
5 4 The Study Area 23
48.01 KB
  4.1 Manora Channel 23
  4.2 Korangi Creek 24
  4.3 Bhambore 25
  4.4 Sandspit 25
  4.5 Hab Delta 26
  4.6 Open Coast 26
6 5 Hydcrographic Conditions In The Study Area 27
298.92 KB
  5.1 Currents 28
  5.2 Temperature 30
  5.3 Salinity 34
  5.4 Dissolved Oxygen 37
7 6 Distribution And Abundance Of Penaeid Eggs, Larvae And Postlarvae In Manora Channel And Korangi Creek 78
574.38 KB
  6.1 Introduction 79
  6.2 General Abundance Of Penaeid Eggs And Larvae In Manora Channel And Korangi Creek 80
  6.3 Relative Distribution And Abundance Of Penaeid Eggs, Larvae And Postlarvae In Manora Channel And Korangi Cnreek 85
  6.4 Genus-Wise Distribution Of Eggs, Larvae And Postlarvae Of The Three Genera: Penaeus Metapenaeus And Parapenaeopsis 97
  6.5 Discussion 106
  6.6 Summary 117
8 7 Distribution And Abundance Of Penaeid Eggs, Larvae And Postlarvae In The Coastal Waters Of Pakistan 151
481.61 KB
  7.1 Introduction 152
  7.2 General Abundance Of Penaeid Eggs, Larvae And Postlarvae (Surface Hauls) 153
  7.3 Relative Abundance Of The Larvae And Postlarvae Of The Three Genera Penaeus , Metapenaeus And Parapenaeopsis (Surface Hauls) 157
  7.4 Area-Wise Distribution Of Eggs And Larvae 161
  7.5 Distribution And Abundance Of Penaeid Eggs, Larvae And Postlarvae (Oblique Hauls 164
  7.6 Discussion 167
  7.7 Summary 173
9 8 Distribution And Abundance Of The Juveniles Of Penaeid Shrimps In The Waters Around Karachi 194
481.6 KB
  8.1 Introduction 195
  8.2 Growth Rate 196
  8.3 Metapenaeus Stebbingi Nobili 197
  8.4 Metapenaeus Affinis (Milne Edwards) 205
  8.5 Metapenaeus Monoceros ( Fabricius ) 211
  8.6 Penaeus Spp. 219
  8.7 Summary 240
10 9 General Discussion 255
117.19 KB
11 10 Bibliography 267
207.42 KB