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3D Visualization of Reservoir and its Applications in Fisheries: A GIS Perspective
(Society of Fisheries Technologists(India), 2016) Nair, V.R.; Pravin, P.; Gopal, N.; Rao, N.H.
Reservoirs are water bodies created using a dam for storage of water. Natural process like erosion in the catchment area and the consequent deposition in various parts of reservoir gradually reduce the capacity of the reservoir. This silt deposition from the upland and surrounding areas poses a threat to the aquatic environment in general and fisheries in particular. Information about the quantity of the silt and the consequent reduction in the capacity of the reservoir is necessary for planning and operational purposes and the same can be estimated through scientific capacity surveys. It is also essential to identify the geomorphological characteristics of the bathymetric area of the reservoir for management of fisheries. This article reviews the research works carried out for development of three dimensional visualization of reservoirs in GIS platform for sustainable fishery management.
Abundance, bathymetric distribution and diversity of deep sea demersal finfish resources along the south-west coast of India
(ICAR, 2013) Govindam, S.V.S.; Sreedhar, U.; Meenakumari, B
Abundance, bathymetric distribution and diversity of deep sea demersal finfish resources along the south-west coast of India were studied. A total catch of 4255 kg (96.7 kg h-1) was recorded by sampling in the depths ranging from 100 to 1100 m. The major constituents were finfishes i.e., teleost fishes (67%) followed by elasmobranchs (14%), crustaceans (13%), cephalopods (2%) and others (4%). Maximum abundance (113.81 kg h-1) of finfishes was observed in the depth zone of 100-300 m, followed by 500-700 m (86.91 kg h-1), 700-900 m (67.71 kg h-1) and 900-1100 m (7.58 kg h-1). Nettastoma sp. (12.13 kg h-1), Lamprogrammus exutus (5.22 kg h-1), Chlorophthalmus bicornis (4.19 kg h-1), Bembrops caudimaculata (5 kg h-1) and Uranoscopus sp. (4.95 kg h-1) were the dominant fish species. The bathymetric distribution of the fishes which occurred more than one time were analysed using measures of the centre of gravity (COG) and the habitat width (HW). The analysis revealed that most of the species exhibited a wide distribution range, although a few were restricted to the greatest depths. Species richness index was maximum (8.25) at 500-700 m depth zone and minimum (3.20) at 900-1100 m depth zone. Species diversity did increase up to the depth of 900 m and declined beyond this depth, whereas the species evenness increased with depth.
Activity periods of certain fishes in Hirakud reservoir
(Society of Fisheries Technologis(India), 1993) Varghese, M.D.; Khan, A.A.; George, V.C.
The activity of some common species of fish was studied on the basis of the number of fishes caught~ gill nets between specific intervals. The results indicated that all the three species investigated, viz., Gudusia chapra, Osteobrama cotio cotio and Eutropiichthys vacha, were active during the first quarter of the day (00:00-06:00 h) and hence is the best period for harvesting these species by gill net.
Aluminium alloy as sheathing material for the wooden hulls of fishing boats
(1965) Balasubramanyan, R.
Trials with indigenous aluminium-magnesium alloy as a substitute for copper in sheathing wooden hulls of mechanized fishing boats have given promising results. Costing only a little over one third as copper, the alloy sheathing has been giving satisfactory service for over 18 months since the boat was commissioned for regular seafishing operations off Cochin.
An analytical study of the sea water slime with reference to bacterial flora
(Society of Fisheries Technologists (India) Cochin, 1977) Pillai, A.G.G.
A detailed study of the primary film of slime with reference to the bacterial flora, its quality and quantity, as observed on different material surfaces exposed to sea water is carried out. A correlation has been established between bacteria and slime deposited on different surfaces .
Belly depth studies for shrimp trawls - Part II
(Society of Fisheries Technologists (India) Cochin, 1970) Mhalathkar, H.N.; Jagadeesan, G.
The paper details further experiments conducted for a reduction in the depth of belly of a 13 .69 m (45') four seam shrimp trawl net . The investigations have given conclusive evidence that the optimum depth of belly for this particular trawl design should be 70 meshes .
Bioaccumulation of chromated copper arsenate (CCA) components in oreochromis mossambicus
(Timber Development Association of India (Dehradun), 2007) Sreeja, A.; Peter, M.A.; Edwin, L.; Meenakumari, B.
The bioaccumulation of copper, chromium and arsenic leached from the rubber wood treated with a waterborne wood preservative CCA was studied in Oreochromis mossambicus. Rubber wood panels dip treated and pressure treated with CCA and commercially available CCA treated marine plywood panels, when exposed to water in the aquaria tanks showed leaching of CCA components into the water. The results of the study indicated that although in minute quantities, copper, chromium and arsenic leaching from the panels gets accumulated in the tissues of fish reared in the aquaria. The bioaccumulation of copper, chromium and arsenic was highest in liver tissues. In muscles, the least accumulation of the metal was observed indicating relatively lower risk to human concerned with the fishes in consumption point of view.
Book Review - ocean forum - An interpretative history of the international north Pacific fisheries commission
(Society of Fisheries Technologis(India), 1987) Unnikrishnan Nair, N.
A brief account on the 'Gunja Net' fishing of the Kutch back-waters (Gujarat)
(Society of Fisheries Technologits (India) Cochin, 1984) Pillai, S.N.; Gopalakrishnan, K.
A survey was made of the fishing gear (Gunja net) and methods used in the prawn fishery of the coastal waters of the Gulf of Kutch.
Bycatch Characterization of Shrimp Trawl Landings off Southwest Coast of India
(Society of Fisheries Technologists (India), Cochin, 2012) Gibinkumar, T.R.; Sabu, S.; Pravin, P.; Boopendranath, M.R.
Bycatch and discards are common and pernicious problems faced by all fisheries globally. It is recognized as unavoidable in any kind of fishing but the quantity varies according to the gear operated. In tropical countries like India, bycatch issue is more complex due to the multi-species and multi-gear nature of the fisheries. Among the different fishing gears, trawling accounts for a higher rate of bycatch, due to comparatively low selectivity of the gear. A study was conducted during 2004 to 2006 using shrimp trawl in the traditional trawling grounds off Cochin in the southwest coast of India to reveal the quality, quantity and monthly variations of bycatch generated by trawlers. Mean monthly bycatch generated by shrimp trawling off Cochin ranged from 1.14 to 38.64 kg h-1, in different months with an overall average of 12.85±1.97 (SE, n=12) kg h-1. Shrimpbycatch ratio ranged from 1:0.6 to 1:6908, during different months. The study identified 281 species including juveniles of commercially important fishes and shellfishes from the shrimp trawl bycatch.
A case history on the phenomenal corrosion of marine propellers in fishing boats
(Society of Fisheries Technologists (India) Cochin, 1973) Balasubramanyan, R.
Although high tensile brassess of copper-zinc alloys (Manganese bronze) find extensive use in all marine applications, under aggressive sea-water, marine propellers cast out of such an alloy frequently suffer heavy corrosion damages due to dezincification . An interesting case history where a number of propellers have undergone dezincification in the Cochin back-waters is narrated in this paper .
Catch analysis in small mesh gillnets
(2003) Saly, N.T.; Hridayanathan, C.
Gill netting provide important advantages over many other fishing methods in a multispecies fishery. However, the simultaneous use of many small mesh sizes in the inshore waters needs monitoring. Landing data from small mesh gill nets of 30, 32, 34, 36, 38, 40, 48, 50 and 52 mm were collected for two years from canoes operating off Cochin. Seasonal usage of different mesh sizes, species composition, size composition and proportion of juveniles in the catch are discussed. A total of 38 species of fishes were caught pointing out the difficulty in managing the tropical multispecies fishery- Of the different mesh sizes used, 30 and 32 min are to be used with restraint, as proportion of juveniles caught in these were substantial- This would render gill netting a more ecofriendly fishing method for the inshore waters.
Catch efficiency of gillnets in shrimp filtration farms at vypeen island, Kerala, South India
(Indian Council of Agricultural Research, 2011) Pravin, P.; Ravindran, K.
A study was conducted in a 77.6 ha perennial shrimp aquaculture farm at Vypeen island, Kerala, India to know the catch efficiency of gillnets in prawn filtration farms. Comparison of catch was made between six different mesh sizes, viz., 28, 32, 34, 36, 38, and 40 mm and the relative catch efficiency of twine sizes, polyamide monofilament 0.16 mm diameter and polyamide multifilament 210 x 1 x 2 and 210 x 1 x 3. Mesh size ranging from 32 to 36 mm showed better efficiency for total catch of prawn and fish together. PA multifilament gillnets caught more of Fenneropenaeus indicus, other shrimps and fish in terms of total weight.
Cathodic protection of aluminium sheathed wooden fishing boats with ternary aluminium anodes
(Society of Fisheries Technologists (India) Cochin, 1980) Pillai, A.G.B.; Ravindran, K.; Balasubramanyan, R.
Results of laboratory and field trials on cathodic protection of aluminium sheathing in fishing boats by ternary aluminium anodes are presented . The high negative potential of 1 .06 V with respect to saturated calomel electrode, its appreciably low anodic polarisation and high current output are favourable factors for using the ternary aluminium anodes . The low rate of consumption of the anode material under service trials attests its economic viability .
Cathodic protection of the hulls of fishing trawlers in India
(Society of Fisheries Technologists (India) Cochin, 1974) Ravindran, K.; Balasubramanyan, R.
ths paper dicussing about the Cathodic protection of the hulls of fishing trawlers in India.
Certain Biological Aspects of Carangoides ferdau (Forsskal, 1775) and Scomberoides lysan (Forsskal, 1775) Caught from drift Gillnets of Kanyakumari Coast
(Society of Fisheries Technologists (India), Cochin, 2008) Balasubramaniam, A.; Chakraborty, S.K.; Venkateshvaran, K.; Meenakumari, B.; Boopendranath, M.R.; Pravin, P.
Carangid species of Cranngoides ferdnu and Scomberoidelysmr caught using large mesh drift gillnets with mesh sizes of 135, 140, 145 and 150 mm from Kanyakumari coast of Tamil nadu, India were studied for two yea rs from September 2002 to April 2004. Biological aspects such as fork length-weight, girth-weight, fork length-gill girth and fork length-maximum girth ratio of these two species were studied. In addi tion, condition factor and length at first maturity also were studied. Both the species exhibited negative allometric growth and 'b' value of the length-weight and girth-weight relationship differed significantly (P
'Chala Vala' Encircling gill nets for sardines and mackerels of the kerala coast with special reference to their design and construction
(Indian Council of Agricultural Research, 1962) Satyanarayana, A.V.V.; Sadanandan, K.A.
For determining the relative efficiency of the gear, a survey of the indigenous gill nets of the Kerala coast, with particular reference to Chala vala was undertaken and the results of the survey are incorporated in the present communication.
Changes in Phosphate fractions in prawn aquaculture systems at different stages of cropping
(ICAR, 2003) Ashraf, M.P.; Pillai, A.G.G.
Studies were conducted to evaluate the flux of phosphate fractions in prawn aquaculture systems in one cropping season and its relation with water and sediment characteristics. The results from the samples of two scientific and one natural culture ponds revealed that there was no loosely bound P in all the three stages of cropping. Al bound P increased significantly at the harvest stage compared to initial stage. This was attributed mainly to readsorption of P on aluminium hydroxides. The utilisation of iron bound P was in the late juvenile stage and that of Ca bound P at the harvest stage. The inorganic P increased from juvenile to late juvenile stage and at harvest it recorded 22.5-36.7% decrease than the late juvenile stage. In the natural pond total P was reduced due to mineralisation of P. 50% of the organic bound P was mineralised in natural pond during initial to late juvenile stage whereas, organic P has only minor role in scientific systems.
Changing pattern of the species composition of ring seine landings
(Society of Fisheries Technologis(India), 1998) Leela Edwin; Hridayanathan, C.
The changing pattern of species composition of ring seine landings is modelled with the help of the Markov chain model to interpret the observed changes and predict the status of dominance of major species. The species selected for the study were oil sardine, other sardines, anchovies, carangids and mackerel. The landings from gear other than ring seines and all gear together have also been analysed. The probability of oil sardine dominating the ring seine catch has come down and in the case of other gear, carangids tend to dominate.
Clap net operation in Brahmaputra valley for capturing Tenualosa ilisha (Hamilton, 1822)
(Society of Fisheries Technologists (India), Cochin, 2018) Baruah, D.; Bhuyan, A.; Dutta, A.; Baiju, M.; Nobi, P.S.; Pravin, P.
Tenualosa ilisha (Hamilton, 1822) is an anadromous fish existing in estuaries and seas and migrates to freshwaters of river Brahmaputra for breeding. Clap nets, locally known in Assam as shangla jal, kholar jal and kami jal are specially designed fishing gear to catch hilsa. This gear has a purse shaped outline and comprises of a bag net supported on an elliptical bamboo frame opening. The net is operated in the month of May-July, when the flood level is high and the water velocity is strong. The maximum catch coincides with the peak migratory season of the fish, encountered in the lower reaches of the river Brahmaputra. Clap nets were observed to have an important contribution in terms of gear preference and selectivity by fishermen associated with hilsa fishing compared to seine nets and gill nets, mostly due to its ease of operation, low cost of fabrication and maintenance, low labour intensity and higher effectiveness.

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