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a life span of about 3 months (Sajan, 2003), and then the annual production will be of 993.6 kg C/km2/yr The area covered in the present study is approximately 55000 km 2 . An average biomass of 4.16 g/m 2 when converted to annual benthic production (Slobodkin, 1962) gives a value of 8.32 g/m 2 /y. The benthic production in tenns of wet weight in the study area of 55000 km 2 will be 0.46 million tones. Since transfer of energy to the next trophic level is approximately 10 %, production transferred to the tertiary level will be 0.046 million tonnes. Meiobenthic annual production will be 11520 kg/km2 (2880 kg/km2 *4) and production from the study area will be 0.6336 million tones. So the total benthic production (macro+meio) will be 1.0936 miilion tones. Considering an ecological transfer efficiency of 10 %, benthic potential will be 0.10936 million tones. According to Somvanshi (1998) present exploitation is 1.875 million tons/y along the west coast of India. Assuming that 92.9 % of which is supported by continental shelf within 200 m depth zone the production will be 1.75 million tons (m. 1.) of which demersal fishery contribute 49% (Sudarsan et aI., 1990). the benthic fish production in the continental shelf will be 0.8558 m. t. Considering the area of the western continental shelf is 75000 km 2 , which supports 0.8558 m. t. benthic fish production, the average demersal fish production in the northwest continental shelf will be about 0.5159 m. t. In the present study, annual benthic potential yield is 0.10936 m t, which can support 21.2% of the current demersal fishery yield of 0.5159 m t. Limitations of the present study were the sampling was done in the 30-200 m and benthic biomass below 30 m depth has not included in the present study. Moreover, epifauna and microfuana, which also contributed significant role to benthic production, were not taken into consideration. Average surface primary production obtained in the near to the coast from the two seasons was 20.43 mg C/m3/d and surface chlorophyll a production was 0.64 mg/m 3 and off coast stations surface primary production was 9.50 mg C/m3/d and 217
surface chlorophyll a was 0.36mg I m 3 (Madhu, 2005). So annual surface primary production will be 745.70 g C/m 3 /y in the near shore region and 346.75 g C/m3/y off coast station with an average of 547 g C/m 3 /y in the continental shelf. Considering the 20% of the surface production reaches the bottom (Damodaran, 1973), about 109 g e/m 3 /y is available for benthos. This showed that the primary production of the overlying water was not a limiting factor for benthic production. 218
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Certificate I hereby certify that t
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Contents Page No. Chapter 1. Introd
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the bottom. Ekman (1935) described
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wonns are the most abundant group a
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leadership of Sir James Clark Ross,
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Ansari et al., (1977b) carried out
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Gopalakrishnan and Nair (1998) cond
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Major objectives:- 1. To understand
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CMFRI (Central Marine Fisheries Res
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Joydas, T.V., Damodaran, R., 2001.
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monitoring committee (Atlantic Mari
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Vizakat Lathika, I-Iarkantra, S. N.
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analysed after acidification by tit
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used as stain prior to sorting and
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space. Therefore, it is very essent
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Fig. I - Station locations 32
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affected at high temperature. Most
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layers exhibit different oceanograp
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Transect wise variation in temperat
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3.2.2.3. Dissolved oxygen (DO) Dist
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monsoon temperature initially incre
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opined that limited mixing. high or
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Naqvi, S. W. A., Noronha, R. J., Re
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orr Mormugao orr Vernal 35.36 35.32
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The continental shelf and its adjoi
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sediments (4 stations). Silty sand
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fine sediments with comparatively h
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Narayana, 1991 ). Limited input of
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In general. two ditlerent patterns
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et al., (1980) reported values in t
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organisms living in the water and t
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Hashimi, N. H., Kidwai, R. M., Nair
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Postma, H., 1967. In Estuaries, Lau
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Depths Sand Silt Clay Organic matte
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• PRE'MONSOON SOUTHERN'TRANSECTS
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as the best indicators of the envir
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showed that northern transects have
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decreased from shallow to deeper de
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different depth zones showed that a
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cm 2 with a dominance of nematodes.
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and 6.08 g/m 2 were recorded during
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were located in the nearshore water
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changes in the hydrographical and t
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factor for such a large difference
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Belegvad, H., 1932. Investigations
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Parulekar, A. H., Harkantra, S. N.,
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Savich, M. S., 1972. Quantitative d
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Traosects Polychaetes Crustaceans M
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Miscellaneous Transects Nematodes C
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Depths Nematodes Cope pods Foramini
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Wagh, 1975; Parulekar et ai, 1976;
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ones and 17 were included in the 'r
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Nephtydae (2%). Among the 20 sedent
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At 75 m zone, 31 groups/species wer
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Porbandar. At 50 m depth zone, fluc
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otTMumbai and Ratnagiri and low eve
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species richness at each depth zone
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E2.2.2.!. Richness (Margalef's inde
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I ):.2.2.2.4. Dominance (Pie/ou's i
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Tablc 17. Contd .. - Sternaspidae 0
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Table 20. contd .. G. alba 20 25 20
Page 179: 150 Taxa 30m 50m 75m lOOm 150 m m D
Page 186: 9% 1% o poIychaete • crustacea o
Page 203 and 204: a) c) e) g) Plate 5 a) Prinospio sp
Page 205 and 206: a) c) e) Plate 7 a) Cardium sp. d)
Page 207 and 208: 7/. /ntroduct ion 7.2. Hydrography
Page 211 and 212: also showed a similar pattern with
Page 213 and 214: y most of the organisms. It was als
Page 215 and 216: with sand of which total density (r
Page 217 and 218: muddy bottom of the west coast of I
Page 219 and 220: crustaceans and miscellaneous group
Page 221: the organic rich environment with h
Page 225 and 226: Icvci (p
Page 227: mcioHmna serve primarily as rapid m
Page 231 and 232: Devassy, V. P., Achuthankutty, C. T
Page 233 and 234: Longhrust, A. R., Pauly, D., 1987.
Page 235 and 236: Sikora, W. B., 1977. The ecology of
Page 237: Faunal groups Silty Clayey Mixed Sa
Page 257: Mannagoa to Porbandar located betwe
Page 260 and 261: against gastropods during pre- mons
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