Fishery Technology Journal

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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.
A Comprehensive Account of Fishing Crafts and Gears of River Tapti, India
(ICAR-Central Institute of Fisheries Technology, Cochin, India, 2022-08-02) S. P. Kamble; Dibakar Bhakta; W. A. Meetei; Vaisakh G.; J. K. Solanki; S. K. Koushlesh; T. N. Chanu; B. K. Behera; V. R. Suresh; S. Samanta; B. K. Das
A Study on the Influence of Bulbous bow on the Resistance of Fishing Vessel Hull form Using CFD Analysis
(Society of Fisheries Technologists (India), 2022-05-05) M. V. Baiju; Vipinkumar; Dhijudas P. H; K. Sivaprasad; Leela Edwin
Bulbous bow forms have a significant effect on the ship resistance components and are today an integral part of many ship designs. The hydrodynamic effect of the bulbous bow is based on the change of flow distribution around the bow, creating waves that interfere with the waves created by the hull, improving the flow around the bow. A properly designed bulb affects nearly all the hydrodynamic properties of the ship. The advancements in structural hydrodynamics is limited in Indian fishing industry and mechanised fishing vessels are not fitted with bulbous bows. This study illustrates the influence of bulbous bow on the resistance of fishing vessels. Computational Fluid Dynamics (CFD) analysis was used for optimisation of ship hull forms, full-scale predictions, and to appraise physical effects of bulbous bow. Geometrical 3D modelling of three reference hull forms namely conventional hull form, hull form with oval type bulbous bow and hull form with Nabla type bulbous bow created using Maxsurf software was chosen to perform test cases to evaluate the influence. Experimental data of three reference hull forms were collected for validation with results of CFD software. The CFD numerical setup stages were illustrated to estimate resistance components such as viscous resistance and wave making resistance. The mesh independency study of hull models were created with results of previous numerical studies. The comparison between the reference hull models and bulbous bow models show the amount of reduction in wave making resistance due to fitting of bulbous bow. The Nabla type hull form gave eduction in drag compared to the conventional hull form.
ACTIVATION MECHANISM OF PRE-PHENOLOXIDASE IN LOBSTER AND SHRIMP.
(Society of Fisheries Technologists (India) Cochin, 1978) SA V AGAON, K. A; SREENIVASAN, A
Phenoloxidase in shrimp and lobster is shown to exist in latent form which could be activated by trypsin and by an endogenous enzyme with ,tryptic activity. On Sephadex G-100 gel, three isoenzymes, differing in molecular weights, were isolated from naturally activated lobster shell extracts. Mechanism of activation of ptephenoloxidase involving limited proteolysis by the activating enzyme to form isoenzymes has been proposed.
Activity of Soil Fungi of Mangalvan, The Mangrove Ecosystem of Cochin Backwater
(Society of Fisheries Technologists (India) Cochin, 1990) PRABHAKARAN, N; GUPTA, RANU
Results of the qualitative screening of fungal isolates for the production of hydrolytic enzymes and phosphate solubilization are given in Table 1. Table 2 presents the percentage of the positive isolates for each enzyme production. It is found that most of the fungal isolates were capable of producing one or the other hydrolytic
Acute Toxicity and Optimal Dose of Clove Oil as Anaesthetic for Blue Hill Trout Barilius bakeri (Day)
(Society of Fisheries Technologists (India)Cochin, 2013) Sindhu, M.C; Ramachandran, A
Stone (1999) and Kildea et al. (2004) have assessed the advantages and disadvantages of clove oil as a fish anaesthetic. Most of them have reported it to be safe and effective anaesthetic but it has a narrow margin of safety. Care must be taken when using high concentrations of clove oil for induction, because ventilatory failure may occur rapidly. A combined view of the findings leads to the recommendation that, for the size of blue hill trout used in the present study, clove oil, with fast induction and rapid recovery times offers a manageable, safe anaesthetic alternative, which can be useful in aquaculture and fish handling activities. In future clove oil would be in use as an anaesthetic in Indian blue hill trout for long distant transportation.
ACUTE TOXICITY OF CADMIUM TO SIX INTERTIDAL INVERTIBRATES
(Society of Fisheries Technologists (India) Cochin, 1984) MOHAN, C. V; MENON, N. R; GUPTA, T.R.C
Following a static bioassay techniques the acute toxicity of cadmium to six species of intertidal invertebrates was determined. The sensitivity of the animals to cadmium was of the following order. Emerita sp. (burrowing crustacean) Donax spiculum (burrowing bivalve) Perna viridis (sedentary bivalve) Sabellaria clandestinus(tube-dwelling polychaete) Modiolus carvalhoi and Modiolus sp. (sedentary bivalves). The above observation was based on the median lethal concentrations recorded for the different species, Emerita sp. 1.35 p.p.m., Donax spiculum 1.8 p.p.m., Perna viridis 2.5 p.p.m., Sabellaria clandestinus 2.8 p.p.m., Modiolus carvalhoi 5.6 p.p.m. and Modiolus. sp. 9.6 p.p.m. The findings throw insight into the toxicity of cadmium to the common intertidal animals which are either suspension or detritus feeders.
Acute Toxicity of Metasystox to \Nedge Clam, Donax cuneatus from west coast
(Society of Fisheries Technologists (India) Cochin, 1987) MULEY, D. V; AKARTE, S. R; KULKARNI, D. A; RAO, K. R
96 h acute toxicity tests were performed using commerciaI grade metasystox on the marine wedge clam, Donax cuneatus during summer 1985. The behaviour and mortality rates were recorded periodically. Most of the dams responded in opening the shell valves and extending the siphons quicker in low test concentrations (0.004-0.0052 p.p.m) but this was slow and late in high concentrations (0.0056-0.008 p.p.m). Mortality began to occur in 0.008 p.p.m. from 12 h, whereas, in 0.0052 p.p.m. from 60 h onwards. The observed LC0 value was 0.004 p.p.m. and LC50 0.0064 p.p.m. The regression equation established was Y = 79.0891 + 33.4523 X. The rate of oxygen concentration increased at LC0 and LC50 values compared to control indicating the disturbed physiological adjustment. The results are correlated with physico-chemical parameters of seawater and discussed in the light of pesticide toxicity to the dam.
Acute Toxicity of Pesticide Endosulfan to the Young Ones of the Fish Channa gachua (ham.)
(Society of Fisheries Technologists (India)Cochin, 2005) Chandrasekaran, V.S; Bisht, H.C.S; Singh, U.P
Static acute (96 h) bioassays were conducted on the spawn (4.0 mm) and the fry (15.5 mm) of freshwater fish Channa gachua (Ham) and the median lethal toxicity (96 h LC ,) of the pesticide endosulfan on the fish were estimated as 9.0 ppm and 22.0 ppm, respectively. When the fishes were exposed from spawn stage up to a period of 30 days in three sublethal concentrations viz. 0.01, 0.02 and 0.05 TU, there was an overall reduction in growth of the fish. While the reduction of growth was greater (up to 58.9%) at 0.05 TU, it was minimum (11.64%) at the medium sublethal concentration of 0.02 TU at the end of 30 days of experimental tenure
Adoption Behaviour and Impact of Technology Transfer among Fish Farmers
(Society of Fisheries Technologists (India)Cochin, 1990) BALASUBRAMANIAM, S; PERUMAL, G
The extent of adoption of eleven improved fish farming practices has been studied among 80 fish farmers. The multiple regression analysis revealed a R’ value of 0.5718. Among the characteristics of fish farmers, distance of fish farm from home, knowledge about improved fish farming and fish yield per hectare had significant positive influence towards their adoption behaviour. The mean impact score of fish farmers was 72.91
Adoption of good management practices by aquafarmers
(Society of Fisheries Technologists (India), Cochin, 2009) Jeeva, J.C.; Balasubramaniam, S.; Srinath, K.
The study was conducted among the aquafarmers in four selected districts viz., Trichur, Alleppey, Ernakulam and Kannur in Kerala. Data were collected on the extent of adoption of good management practices among the sample respondents. Of the 10 practices evaluated, the adoption scores were higher for six practices viz., preparation of ponds (93.15%), eradication of predators and weeds (85.39%), use of PCR tested seeds (84.47%), use of recommended feeding schedule (77.63%), water exchange and quality monitoring (71.69%) and harvesting after prescribed days of culture (70.32%). The extent of adoption of each practice varied significantly (p < 0.01) among the aquafarmers with the overall mean adoption score of 70.09% (n=73). The variables viz., number of training programmes undergone, number of information sources utilized and expert services availed, were found to have positive relationship with the extent of adoption. Regression analysis revealed that of the seven variables, only one variable viz., number of training programmes undergone had contributed significantly (p < 0.05) towards the extent of adoption of improved practices.
Adoption of hygienic practices at fish landing centres and markets
(Society of Fisheries Technologists (India), Cochin, 2009)
The study was conducted at the fish landing centres in selected four districts of Kerala viz., Trichur, Alleppey, Ernakulam and Kannur, and the fish markets in Ernakulam district. In the case of landing centres, of the six practices evaluated among the fishermen, the adoption score was higher for only one practice viz., use of clean containers for fish handling (81.03%). Low level of adoption was observed on two practices viz., use of adequate clean water for washing fish (39.49%) and prompt system of waste disposal (40.00%). The overall adoption index was 54.96%. The 'F' test results revealed that the extent of adoption varied significantly among the fishermen in the four districts. The perception index for the impact of popularization efforts undertaken among fishermen was 55.26%. The R super(2) value indicated that all the variables put together served as a cause of 71.60% variation in the adoption level. In case of fish markets, the overall index for the availability of infrastructural facilities was 79.74%. The fish marketing personnel were well aware of all the seven hygienic practices studied, with the overall awareness index of 93.60%. Of the six hygienic practices measured, practices such as the use of clean containers or polythene sheets for keeping fish (89.55%), using adequate clean water for washing (98.51%), sorting of fish hygienically in a clean place (84.33%), using adequate ice for preventing fish spoilage (98.51%) and maintaining personal cleanliness and handling of the fish hygienically (94.78%), were adopted by majority of the respondents. Lower adoption was observed in the case of using prompt methods of waste disposal (68.66%). The regression analyses revealed that education positively influenced the extent of adoption among the fish marketing personnel.
Adoption of Improved Aquaculture Technologies in Tripura, India
(Society of Fisheries Technologists (India)Cochin, 2014) Das, Apu; Kumar, Nalini Ranjan; Krishnan, M.; Yadav, Vinod Kumar; Immanuel, Sheela
The study was undertaken in the state of Tripura to identify the constraints in adoption of improved fish culture practices under aqua-model village scheme implemented by Department of Fisheries, Govt. of Tripura during 2004-05 to 2010-11. By using multistage stratified random sampling, data were collected from 80 farmers each from the adopted and non-adopted villages respectively. It was found that the extent of adoption of improved practices in aquaculture farms of adopted villages was significantly more than that of non-adopted villages. Correlation and regression analysis between socioeconomic parameters and adoption indices revealed that education and training played an important role in adoption of improved aquaculture technologies. Using Rank Based Quotient (RBQ), constraints faced in adopting the improved aquaculture technologies were also documented.
Adoption of Improved Practices in Freshwater Fish Farming
(Society of Fisheries Technologists (India)Cochin, 2013) Kappen, Daisy C; Thomson, K.T; Dinesh, K
The study was undertaken to know the extent of adoption of improved practices in freshwater fish farming in the state of Kerala and to find out the relationship between the socio-psychological and economic characteristics of freshwater fish farmers with the level of adoption. One hundred fish farmers from all the 14 districts of Kerala were selected using proportionate random sampling technique. Data were collected with the help of a structured interview schedule. The results showed that majority (70%) of the respondents had medium level of adoption. Maximum adoption was observed in the practices of stocking the pond with selected species, followed by acclimatization of the seeds. Least amount of adoption was noticed in the case of maintenance of dissolved oxygen followed by application of inorganic fertilizer. The variables viz., information source utilization, social participation, marketing orientation and extension participation showed positive and significant association with level of adoption of the respondents, while risk orientation was negatively and significantly correlated. Twelve variables taken together for the multiple regression analysis explained 71% of variation in the adoption level. Out of the total 71% variations explained by the independent variables together, 70% was explained by the variables viz., occupation, information source utilization, risk orientation, marketing orientation and extension participation.
Adoption of oyster culture by women in Kerala
(Society of Fisheries Technologists (India)Cochin, 2008) Immanuel, Sheela
A study was conducted with the objective of examining the socio economic impact of the technology that was transferred to the women folk through variuos methodologies and to empower these women both socially and economically through the adoption of these technologies. Fisher folk in the coastal belts were identified from selected villages viz., Ayiramthengn (23), Dalavapuram (24) and Azheekal (23)and the technology of edible oyster culture was demonstrated. Data were collected from the women with the help of a structured interview schedule. Data were collected for a period of three months during the year 2002- 03. Percentage analysis was done to categorise them under different groups. The study indicated that group farming appears to be the ideal means for the propagation of oyster culture in this region. Serious constraint faced by these groups were identified and suitable remedial measures suggested to overcome the constraints.
Adoption of Quality Control Measures in Centralised and Decentralised Prawn Peeling Units - A Comparative Study
(Society of Fisheries Technologists (India) Cochin, 1992) Gupta, Jancy
A comparative study on the infrastructural measures adopted in centralised and non centralised prawn peeling units was carried out. lt was found that the centralised prawn peeling units had significantly high infrastructural facilities related to quality control compared to non centralised peeling Lmits. lmposition of quality control measures helped to improve the quality standards of peeling sheds considerably.
Adoption of quality management practices in seafood processing sector in cochin region
(Society of Fisheries Technologists (India), Cochin, 2012) Balasubramaniam, S.; Jeeva, J.C.; Ashaletha, S.
The study was conducted in 34 fish processing units in Ernakulam and Alleppey districts of Kerala, India. Data were collected on the general profile of the seafood processing units, availability of infrastructural facilities and managerial role performance of fish processors. The results revealed that 76.47% of the units were EU approved and 23.53% were Non-EU units. The average quantity handled per day was 11.12 t while the production capacity was 21.51 t day super(-1). For the availability of infrastructural facilities in the processing units, the adequacy index was more than 90. The overall role performance index of the fish processors was found to be 74.46. The adoption of quality management practices was determined in terms of good hygienic practices (Mean: 99.51%), good manufacturing practices (Mean: 97.65%), standard sanitation operation procedures (Mean: 99.08%) and good laboratory practices (Mean: 96.33%). The significant 'F' value in the multiple regression analysis revealed the overall significance of influence of 14 independent variables when taken together in explaining the extent of adoption of good hygienic practices by the fish processing units. Of the fourteen variables, only type of approval and adequacy of infrastructural availability in the processing units positively contributed towards the extent of adoption of quality management practices. The R super(2) value indicated that the 14 variables selected together explained 67.70% of variation in the adoption level. The major constraints expressed by the processors were also listed out.
Aflatoxins and their Repercussions in Aquaculture: A Review
(Society of Fisheries Technologists (India), 2022-05-05) Deepa Bhatt; Abhed Pandey
Allometric Relationships in the Mussel, Musculista senhausia from Cochin Backwaters
(Society of Fisheries Technologists (India)Cochin, 1995) Sreedhar, K. Shiny; Radhakrishnan, C.K
The allometry of a population of Musculista senhausia (Benson) were studied during the period from February 1987 to June 1988. Monthly samples were taken from Cochin back\vaters and the allometric relationships between length and height, depth, total weight, flesh weight and shell weight were determined. The relationships are described by regression analysis of pairs of variables. Covariance analysis of the data revealed significant monthly differences in these relationships except in length-height and the factors causing these fluctuations are discussed.
Alterations in the Growth and Haematological Response of Catla catla (Hamilton, 1822) Exposed to Different Salinities
(Society of Fisheries Technologists (India), 2022-05-05) Mohana Swapna Narra; T. V. Ramana; A. Balasubramanian; T. Neeraja; R. S. Sravani; M. Rajani
Investigation was carried out to study the effect of different salinities (3, 6, 9 ppt and control (0 ppt) on growth and haematological parameters of Catla catla juveniles having length and weight of 12.6±0.13cm and 18.26±0.07g respectively for about 30 days. The study revealed zero salinity (control) encouraged high growth (19.72±1.04 g), Specific Growth Rate (SGR) (0.52±0.13) and Protein Efficiency Ratio (PER) (3.08±0.26) at control than higher salinities. However, Food Conversion Ratio (FCR) was high at 9 ppt (7.30±2.04) and low at control (1.36±0.15). High leukocyte count was observed at 9 ppt (43.02±1.09) compared to control (36.87±0.50) whereas erythrocyte (2.29±0.19), haemoglobin (10.60±0.44) and haematocrit (31.53±1.12) were higher at control than at 9 ppt. Mean Corpuscular Volume (MCV) showed high at 3 ppt (141.14±09.98) while it was low at 9 ppt (131.79±13.46). Nevertheless, Mean Corpuscular Haemoglobin Concentration (MCHC) was high at zero salinity (33.64±1.17) and low at 9 ppt (28.34±1.050). Study inferred that alterations in the growth and haematological parameters occurred at higher salinities compared to lower salinity levels.

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