Fishery Survey of India

Mumbai, India

Fishery Survey of India

Mumbai, India
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Sajeevan M.K.,Kerala University of Fisheries and Ocean Studies | Sanadi R.B.,Fishery Survey of India
Indian Journal of Geo-Marine Sciences | Year: 2016

Pelagic stingray, formerly considered as a rare species is becoming a major bycatch of tuna longline fishery. Present study is an attempt to understand the abundance of pelagic stingray in time and space around Andaman & Nicobar Islands. General linear model has been fitted by using exploratory tuna longline survey data collected from A & N Islands. The study provided an account on the abundance and distribution pattern of the species. Present study recorded better catch rates during the new moon period and the results indicated the significant effect of the lunar cycle on the catch rate of pelagic stingray. Almost nil catch rate recorded during monsoon period was quite interesting and results showed that there is a significant effect of the monsoon on the catch rate. An increasing trend of the year wise catch rates indicates the fishing pressure on the co existing oceanic resources. © 2016, National Institute of Science Communication and Information Resources (NISCAIR). All rights reserved.

Varghese S.P.,Cochin Base of Fishery Survey of India | Somvanshi V.S.,Fishery Survey of India | Dalvi R.S.,Fishery Survey of India | Dalvi R.S.,Maharshi Dayanand College
Hydrobiologia | Year: 2014

Information on the ecology and feeding behaviour of the large oceanic predatory fishes is crucial for the ecosystem approaches to fisheries management models. Co-existing large pelagic predators in the open oceans may avoid competition for the limited forage by resource partitioning on spatial, temporal or trophic levels. To test this, we studied the prey species composition, diet overlap, trophic level, and trophic organisation of 12 large predatory fishes co-existing in the eastern Arabian Sea. Stomach contents of 1,518 specimens caught by exploratory longline operations in the Indian Exclusive Economic Zone during the years 2006-2009 were analysed. Finfishes were dominant prey of all species except blue marlin (Makaira nigricans) and yellowfin tuna (Thunnus albacares), which fed mainly on cephalopods, and long-snouted lancetfish (Alepisaurus ferox) and pelagic stingray (Pteroplatytrygon violacea), which fed mainly on crustaceans. Common dolphinfish (Coryphaena hippurus) and yellowfin tuna fed on a wider variety of prey than the other species, while the diets of lancetfish and black marlin (Istiompax indica) were narrowest. Pelagic stingray and great barracuda (Sphyraena barracuda) fed on species occupying epipelagic waters, whereas the contribution of mesopelagic prey was higher in the diets of swordfish (Xiphias gladius) and pelagic thresher (Alopias pelagicus). Trophic levels of these fishes ranged from 4.13 to 4.37. Diet overlap index revealed that some of the large pelagic predatory fishes share common prey species. Cluster analysis of the diets revealed four distinct trophic guilds namely 'flyingfish feeders' (common dolphinfish and great barracuda); 'mesopelagic predators' (pelagic thresher and swordfish); 'crab feeders' (lancetfish, pelagic stingray and silky shark) and 'squid feeders' (yellowfin tuna, Indo-Pacific sailfish (Istiophorus platypterus), skipjack tuna (Katsuwonus pelamis), black marlin and blue marlin). Large predatory fishes of the eastern Arabian Sea target different prey types, and limit their vertical extent and time of feeding to avoid competing for prey. © 2014 Springer International Publishing Switzerland.

Varghese S.P.,Cochin Base of Fishery Survey of India | Somvanshi V.S.,A 1 Tower | Gulati D.K.,Fishery Survey of India
Indian Journal of Marine Sciences | Year: 2013

Present study consists the studies on the stomach contents of Indo-Pacific sailfish, Istiophorus platypterus (Shaw, 1792), caught during tuna longline survey conducted in the western Indian EEZ (eastern Arabian Sea) between 2006 and 2009 to investigate the sexual, ontogenetic and seasonal effects in the diet. Stomachs of 290 specimens in the forklength range of 101-261 cm were examined, of which 38 (13.10%) were empty. Prey composition was assessed in terms of occurrence by number, frequency of occurrence, weight and Index of Relative Importance. Quantile regression techniques were used to determine the mean and upper and lower bounds of the relation between prey size and sailfish length. Diet was dominated by teleost fishes, followed by cephalopods while crustaceans were represented in limited instances. Purpleback flying squid, Sthenoteuthis oualaniensis, was the most preferred prey species. Other important prey species identified were Euthynnus affinis, Cubiceps pauciradiatus, Gempylus serpens and Onychoteuthis banksii. Diet did not varied by sex, but the ontogenetic and seasonal variations in diet were significant. The maximum and mean size of prey increased with length of sailfish. However, relatively smaller prey constituted bulk of sailfish diet and even large specimens consumed small prey.

Varghese S.P.,Cochin Base of Fishery Survey of India | Vijayakumaran K.,Fishery Survey of India | Anrose A.,Chennai Base of Fishery Survey of India | Mhatre V.D.,Fishery Survey of India
Turkish Journal of Fisheries and Aquatic Sciences | Year: 2013

Distribution, abundance and biology of swordfish, Xiphias gladius, of the Indian seas were investigated by analyzing the data gathered during tuna longline surveys conducted by the Fishery Survey of India (FSI). Study undertaken during the period from 2004 to 2010 revealed swordfish Catch Per Unit Effort of 0.02 numbers in 100 hooks from the Arabian Sea; 0.01 from Bay of Bengal and 0.02 form the Andaman and Nicobar waters. About 16% of the specimens caught were juveniles and the sex ratio of smaller fishes was in favour of males, whereas, larger specimens were mostly females. Length-weight relationship established indicated slightly positive allometric growth of the species and length based models revealed difference in growth between sexes. The growth parameters estimated for females were: asymptotic length (L∞) = 311.11 cm, growth coefficient (K) = 0.17/yr and age at zero length (t0) = -0.53 yr, whereas, the growth parameters estimated for males were: L∞ = 243.79 cm, K = 0.22/yr and t0 = -0.37 yr. Diet was dominated by finfishes and cephalopods, while crustaceans were recorded rarely. Sthenoteuthis oualaniensis was the dominant prey species, followed by Paralepis sp. Spawning area was identified in the Lakshadweep waters from where mature females with hydrated oocytes were caught during December to April. Size at 50% maturity for females was estimated at 164.03 cm, which is reached at about four years of age. Mean batch fecundity was 4.5 million, while the relative fecundity was 37.5 hydrated oocytes per gram of body weight and the diameters of mature oocytes were in the range of 0.9-1.6 mm. Our results provide preliminary information on the abundance, growth and biology of this species in the Indian seas which should be useful to fishery managers. © Published by Central Fisheries Research Institute (CFRI) Trabzon, Turkey.

Varghese S.P.,Fishery Survey of India | Somvanshi V.S.,Fishery Survey of India | John M.E.,Fishery Survey of India | Dalvi R.S.,Fishery Survey of India | Dalvi R.S.,Maharshi Dayanand College
Journal of Applied Ichthyology | Year: 2013

The aim of the study was to identify the diet composition, feeding preferences, size and sex related diet changes, and to calculate the consumption rates of common dolphinfish, Coryphaena hippurus, in the eastern Arabian Sea. Fish were caught using longline gear during the years 2006-2009. Stomachs of 238 specimens with fork lengths ranging from 324 to 1250 mm were analysed; 72 (30.25%) of the stomachs were empty. Epipelagic finfishes were the predominant prey followed by cephalopods and crustaceans. Occurrence of items such as sargassum, sea fans, corals, plastics and pieces of wood in the stomachs indicate an opportunistic and voracious feeding nature. Flyingfishes (family Exocoetidae), especially Exocoetus monocirrhus (%IRI 16.92), dominated the diet. Unidentified filefishes (family Monacanthidae), Sthenoteuthis oualaniensis, Euthynnus affinis, Cheilopogon furcatus and Cubiceps pauciradiatus were other important food items. The diet varied between sexes and different size classes. Juveniles and adults (size classes <75 cm, 75-95 and 95-115 cm) fed mainly on epipelagic finfishes, whereas the large adults (>115 cm) fed preferentially on cephalopods. Food consumption rate was higher in females (6.37% BW day-1) compared to males (4.04% BW day-1), and increased with their increase in size up to 75-95 cm length classes, thereafter decreasing. The daily meal and daily ration was 332.63 g day-1 and 5.25% BW day-1, respectively, and average annual food consumption was 121.41 kg. © 2013 Blackwell Verlag GmbH.

Naik S.K.,Fishery Survey of India | Shivam A.,Fishery Survey of India | Kar A.B.,Fishery Survey of India
Indian Journal of Geo-Marine Sciences | Year: 2015

Result of the studies made on live sharksucker (commonly known as sucker fish) Echeneis naucrates Linnaeus 1758 collected from November 2003 to October 2005 from the Central west coast of India is discussed in this study. Study indicated the dominance of male with a sex ratio (M:F) of 1:0.4. Length–weight relationship for male and female sucker fish was W=0.0006536 L3. 3829(r=0.98) and W=0.0002620 L3. 6255(r=0.93) respectively. Regression equations between them differed significantly (F= 35.83). There were seven stages of maturity and twelve stages of ova observed in the species. Ova observed were between 5-8 and 169-172 micrometer division (0.1-0.16 mm and 1.85-1.89 mm respectively). Size at first maturity was 51cm. Fish appears to be a batch spawner. About 38% of the fishes were found with empty stomachs. Gut content analysis showed that the food items are mainly cephalopods and juvenile fishes especially lizard fishes, goat fishes, threadfin breams and anchovies. Females were found to be poor feeders. © 2015, National Institute of Science Communication and Information Resources (NISCAIR). All rights reserved.

Kar A.B.,Fishery Survey of India | Ramalingam L.,Fishery Survey of India | Govindaraj K.,Fishery Survey of India
Indian Journal of Geo-Marine Sciences | Year: 2015

In the present paper an attempt has been made to study the age and growth of Indo Pacific Sailfish by analyzing the length frequency and length weight data. Females were recorded in the length range of 113 to 232cm (fork length) and males were in the length range of 131cm-228cm (fork length). Length weight relationship for the species was W = 0.00006 L2.48, (r= 0.97) for male and for female it was W = 0.00002 L 2.64 (r = 0.95). A comparison of negative allometric growth between males and females using t- test and ANOVA indicated no significant difference between the length- weight relationships of both the sexes. Slope for male (t =2.16, df= 75) and female (t= 2.68, df = 68) were not significantly different from 3. Regression lines for male and female were not significantly different (F = 0.4772). Hence a combined equation was worked out and it was W = 0.00004 L2.52, r (=0.96). Growth parameters such as L∞, K and t0 for females were 246.8 cm, 0.33/year and -0.28 respectively and for males theses were 236.3cm, 0.48/year and -0.19 respectively. Longevity of females (8.8 years) was more than that of the males (6.1 years). VBGF curves indicated rapid initial growth for both the species and the growth of the males was more in comparison to the females. © 2015, National Institute of Science Communication and Information Resources (NISCAIR). All rights reserved.

Sajeevan M.K.,Fishery Survey of India | Somvanshi V.S.,Fishery Survey of India
Indian Journal of Marine Sciences | Year: 2013

Marine ornamental fishes form a significant share of trawl fishery, which are generally discarded. Methodology followed for live collection of marine ornamental fish and equipments used are presented in the paper. Occurrence of live ornamental fishes in the trawl catches and factors affecting the survival rate of collected fishes are discussed. A check list of 66 species belonging to 35 families collected during the study is added in the text. Altogether 22 species were recommended as most suitable species for beginners, as they are hardy and easy to maintain in the tanks. Need for an in depth study on the distribution and abundance of the marine ornamental fishes often caught in the trawl fishery of the country is highlighted to evolve exploitation and utilization strategy. Results of present study will helps to overcome the present hurdles in the industry i.e. non-availability of continues supply of ornamental fishes for stocking.

Solanki H.U.,Marine and Water Resources Group | Prakash P.,Marine and Water Resources Group | Dwivedi R.M.,Marine and Water Resources Group | Nayak S.,Marine and Water Resources Group | And 2 more authors.
International Journal of Remote Sensing | Year: 2010

This study uses synergistic application of satellite-derived chlorophyll concentration (CC), sea surface temperature (SST) and sea surface wind (SSW) for forecasting potential fishing zones (PFZs). PFZs are validated in near-real time through fishing operations and detailed statistical analysis of fishing operation data. CC and SST images were derived from Indian Remote Sensing Satellite-Ocean Colour Monitor (IRS-OCM) and NOAA-AVHRR, respectively, to delineate the oceanographic features exhibiting different oceanic processes. QuikSCAT/SeaWinds derived sea surface wind vectors were used to understand, quantify and demonstrate the variability of wind-induced water mass flow as well as their impacts on features/oceanographic process. Oceanographic features such as eddies, rings and fronts were found to be shifted according to the speed and direction of the wind. An algorithm was developed to compute water mass transport and feature shift. An improved methodology was developed and demonstrated using these prime variables, which are responsible for fishery resources distribution. PFZ forecasts were generated and validated through near-real-time fishing operations. The fishing operations data were taken from the logbooks of fishing vessels for detailed statistical analysis. On average, 80% of observations were recorded with more yield than monthly mean catch in the respective areas. A paired t-test showed statistically significant results. © 2010 Taylor & Francis.

Varghese S.P.,Fishery Survey of India | Somvanshi V.S.,Fishery Survey of India | Varghese S.,Fishery Survey of India
Indian Journal of Marine Sciences | Year: 2010

Distribution pattern of longnose lancetfish, Alepisaurus ferox Lowe, 1833 in the Indian Exclusive Economic Zone had been analyzed for the period January 2005 to December 2007. While longnose lancetfish is caught from almost all the areas surveyed in the Bay of Bengal and Andaman and Nicobar waters, it is is not caught from areas north of latitude 16°24′N of the Arabian Sea. Discontinuous distribution of longnose lancetfish in the Indian EEZ can be related to the existence of perennial Oxygen Minimum Zone in the northern Arabian Sea. Present study also consists the results of preliminary studies on the biology of this species.

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