Fishing Technology

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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.
Abundance, characteristics and seasonal variation of microplastics in Indian wgite Shrimps (Fenneropenaeus indicus) from coastal water off Cochin,Kerala,India
(Elsevier, 2020) Daniel, Damaris Benny; Ashraf, P. Muhamed; Thomas, Saly N
The microplastic contamination of seafood species is increasingly becoming a global concern due to its potential influence on food safety and human health. This study investigated the presence and seasonal variation of microplastics in a commercially important marine shrimp species, Fenneropenaeus indicus, from the coastal waters of Cochin, India. The soft tissues of 330 shrimps were examined over a period of 12 months, from March 2018 to February 2019. A total of 128 microplastics were detected, of which 83% were fibres. An average (mean ± SD) of 0.39 ± 0.6 microplastics/shrimp (0.04 ± 0.07 microplastics /g wet weight) was obtained from the shrimps sampled. Microplastic contamination was significantly higher in July-August (Monsoon season) compared with other months. This study reports microplastic contamination in F. indicus for the first time. Results also suggest that consumption of peeled but undeveined or whole dried white shrimps can be one of the ways of the human uptake of microplastics, especially during the monsoon season.
An account of trawl fishing off Kakinada
(Society of Fisheries Technologists(India),Cochin, 1985) Narayanappa, G.; Sitaramarao, J.; Ramarao, S.V.S.; Naidu, R.M.; Satyanarayana, A.V.V.
In the present communication the authors have reviewed the trends of bottom trawling for the last one and a half decades off Kakinada. Performance of various designs of two-seam and four-seam trawls was also assessed. On an average the catch rate was found to be 33.3 kg h-1. The five yearly landings were worked out for three periods, 1967-71 period to be the most productive. There is considerable reduction in the catch per unit effort during 1972-76 and 1977-81 periods. The catch rate was lowest during 1977-78. An attempt to correlate the catch with the increase in the number of fishing boats from year to year.
Accumulation and release of petroleum hydrocarbons by mytilopsis sallet from the harbour waters of Visakhapatnam
(Society of Fisheries Technologists(India),Cochin, 2003) Prakash, R.R.
Marine organisms are known to accumulate petroleum hydrocarbons in their tissue from the surrounding environment or through the food chain . Bivalves being sedentary filter feeders are extremely vulnerable to both chronic and acute exposures to petroleum hydrocarbons. In the recent years, due to increasing activity of bulk carriers, oil tankers, industrial activities and other anthropological activities, considerable amount of oil is finding its way into the coastal waters around Visakhapatnam. Mytilopsis sallei, a marine bivalve occurs in the vicinity of the harbour waters where petroleum hydrocarbons are present in high concentrations. The initial levels of petroleum hydrocarbons in the tissue of M. sallei reflected on the amount of petroleum hydrocarbons in the medium. M. sallei accumulated PHC in the tissue to a level greater than that found in the surrounding medium. A direct relationship exists between the initial concentration and that of the amounts retained after depuration. Total elimination of petroleum hydrocarbons could not be achieved even after 30 days of depuration
Acoustic fish detection and gear monitoring devices
(Central Institute of Fisheries Technology, 2009) Boopendranath, M.R.
Introduction of acoustic fish detection devices is one of the most significant developments in modern fishing. Important fish detection devices are echo sounder and sonar. Technological advances in electronics and research into underwater acoustics have led to tremendous improvements in echo sounder and sonar and made them more reliable and affordable.
Acoustic pingers: prevention of fish catch depredation and dolphin entangling
(Central Institute of Fisheries Technology, Cochin, 2017) Edwin, L.; Joseph, R.; Raphel, L.
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.
Adoption of square mesh codends for the trawl fishery: a success story along Sindhudurg coast, Maharashtra
(Central Institute of Fisheries Technology, Cochin, 2018) Madhu, V.R.; Vasudevan, N.; Edwin, L.
Advantages of large mesh in mid water trawl
(CIFT, 1994) Vijayan, V.
Advantages of square mesh codend on the conservation of demersal fisheries in EEZ
(Department of Ocean Development , New Delhi, 1996) Pillai, S.N.; Varghese, M.D.; Abbas, S.M.; Iyer, H.K.
Square mesh in the codend play an important role on the selectivity of trawl gear and the conservation of resources. Comparative fishing trials between the square mesh and diamond mesh codends were carried out in deeper waters from FORV Sagar Sampada. The length frequency measurements of the important species of fish caught in both the codends showed the supremacy of square mesh by retaining more bigger fish and eliminating under sized and juvenile fishes, than the diamond mesh.
Aimed fishing
(Central Institute of Fisheries Technology, 2000) Vijayan, V.
Aimed trawl fishing techniques involves searching for, finding and evaluating fish schools with the sonar, correctly navigating the vessel towards the selected school, establishing the accurate depth and configuration of the school by echo-sounding and steering the trawl to the required depth, as indicated by the net sonde.
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 .
Application of geographic information system in fisheries management
(Central Institute of Fisheries Technology, 2009) Prakash, R.R.
Geographic information system (GIS) is a computer based information system designed to work with spatially reference data. GIS technology integrates common database operations such as query and statistical analysis with the unique visualization and geographic analysis. These abilities distinguish GIS from other information systems and make it valuable for explaining events, predicting outcomes and planning strategies and hence GIS is looked upon as a tool to assist in decision making and management of attributes that needs to be analyzed spatially .
Application of remote sensing and GIS in fisheries
(ICAR - Central Institute of Fisheries Technology, Cochin, 2012) Madhu, V.R.
An appraisal of trawl fishery of Kerala
(Asian Fisheries Society Mannila, 2009) Hassan, F.; Sathidas, R.
Trawl fishery of Kerala contributes about 35-50% of the annual landings of the state. The ever increasing international demand for shrimps and cuttlefishes further induced acute competition, higher investment and continuous up gradation of trawlers. The technical specifications, capital investment, catch composition and revenue for single and multiday units has drastic differences. The present study aims to highlight the trawl landings of Kerala state and comparative efficiency of these units operating at Cochin Fisheries Harbour. The data was systematically collected during 2005-2006 in a pre-designed schedule covering all seasons. The secondary data was obtained from various publications of State Fisheries Department and CMFRI.The craft and gear specifications of these units indicate the increasing trend of capital intensity in an already overcapitalized sector. The study indicates that the shift towards multi-day units will further increase due to better catch and returns. Although the multi-day trawlers are economically efficient, the wastes and discards generated from these units are not advisable forthe long-term sustainable development of our open access marine fisheries. Regulations in termsof number of units, unit operations or quota system for trawlers appear to be imminent for theefficient management of marine fishery resources of the state.
Artisanal fishing gears of Visakhapatnam
(Society of Fisheries Technologists (India), Cochin, 2005) Sreedhar, U.; Rajeswari, G.; Prakash, R.R.
Visakhapatnam along with Kakinada coast shares the status of being the major fish landing Centre in the east coast of India. The traditional fisheries off Visakhapatnam are diverse in terms of fishing gear and methods. In recent years, specific gears have been developed for commercially important species by standardizing the twine size and mesh size. The multi-walled trammel net has been adopted for effective exploitation of crustaceans with necessary changes. Use of monofilament has .been popular among fishermen in this area. Fishermen of this coast have adopted certain innovations such as use of artificial lure in place of natural bait. Larger units of hooks and lines have also been in use as a result of motorization of the craft and operations have shifted to deeper waters. Increased competition in the fishing industry coupled with the diminishing returns have resulted in fishermen using codend mesh size up to 5 mm in boat seines and shore seines. In view of these changes, there is an urgent need to assess the present artisanal fishing practices prevailing in the coast in order to promote eco-friendly and low energy fishing practices. This article provides an overview of the traditional fishing gears operated, off Visakhapatnam coast. The technological and operational details of major traditional fishing gear and methods namely gillnets, boat seines, beach seines and lines are described. Suggestions for making indigenous gear more eco-friendly and cost-effective are provided.
Assessing temporal variation of coloured dissolved organic matter in the coastal waters of south eastern Arabian sea
(Springer, 2020) Minu, P.; Souda, V.P.; Baliarsingh, S.K.; Dwivedi, R.M.; Ashraf, P.M.
Coloured dissolved organic matter (CDOM) plays a major role in marine photochemical and biological processes and its optical properties are known to affect the underwater light penetration. This paper highlights in situ optical estimation and satellite retrieval of CDOM in deciphering its temporal variations in coastal waters of the South Eastern Arabian Sea. The study accentuated the source of CDOM as terrigenous origin during monsoon, of in situ productions during pre-monsoon and during post-monsoon of autochthonous-allocthonous origin. The matchup analysis for in situ and MODIS Aqua retrieved Adg443 exhibited bias which decreased by incorporating the seasonal component. The study also identified degrading bloom of Noctiluca scintillans as the source for exceptionally high CDOM in the area during January and February. The study demands to incorporate seasonal components and phytoplankton abundance while assessing the performance of CDOM algorithms in optically complex coastal waters.
Assessment of bio accumulation of bacteria in oyster from shellfish growing waters in Ashtamudi Lake(Kerala, India): A RAMSAR wetland
(Elsevier, 2016) Chinnadurai, S.; Mohamed, K.S.; Sharma, J.; Venkatesan, V.; Kripa, V.

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