Browsing by Author "NEETHISELVAN, N"
Now showing 1 - 5 of 5
Results Per Page
Sort Options
ThesisItem Open Access ANALYSIS OF TUNA FISHERY ALONG THOOTHUKUDI COAST OF TAMIL NADU(Fisheries College and Research Institute, Thoothukudi, Tamil Nadu Fisheries University, 2017) RAMESH KUMAR; SUNDARAMOORTHY, B; NEETHISELVAN, N; ATHITHAN, SThe present study was carried out from June 2016 to May 2017 to analyse of tuna fishery along Thoothukudi coast of Tamil Nadu. The data on tuna fishery were collected from Tharuvaikulam, Therespuram, Thoothukudi Fishing Harbour and Kombudurai fish landing centers of Thoothukudi coast. Fishing crafts such as mechanized and motorized gillnetters (13.41 to 18.28 m OAL), trawlers (12.19 to 27.43 m OAL) and FRP boats (8.22 to 10.05 m OAL) and fish gears namely drift gillnets (mesh size 120 to145 mm), longlines (hook size 5 to 7), handline (hook size 4 to 7) and trawl nets (codend mesh size 20 mm) were found employed in exploitation of tuna fishery resources of Thoothukudi coast. Of the four types of fishing gears employed in exploitation of tuna fishes along Thoothukudi coast, only drift gillnets were found operating by targeting tuna. There were 43 tuna fishing grounds reported from the distance of 9 to 110 Nm from shoreline along Thoothukudi coast. The fishing crafts were operated for both single day and multiday at a depth ranging from 20 to 500 m. Tuna fishery of Thoothukudi was supported by six species including four coastal tuna (Euthynnus affinis, Auxis thazard, Auxis rochei and Sarda orientalis) and two oceanic tuna (Thunnus albacares and Katsuwonus pelamis). Out of six, four species of tuna viz. Thunnus albacares, Katsuwonus pelamis, Euthynnus affinis and Auxis thazard were reported throughout the year, whereas two species Auxis rochei and Sarda orientalis landed seasonally. Tuna fishing was recorded throughout the year along Thoothukudi coast with peak during June to September. Of the six tuna species reported along Thoothukudi coast, two oceanic species namely T. albacares (56.25 %) and K. pelamis (19.46 %) were found to contribute to as much as 75.71 % in the total tuna catch. The coastal tunas such as E. affinis (16.85 %), A. thazard (6.03 %), A. rochei (1.09 %) and S. orientalis (0.33 %) together contributed 24.29 % to the total tuna catch. Maximum tuna catch was contributed by large meshed drift gillnets with 98.75% of total tuna catch followed by longlines, trawl nets and handlines with 0.75%, 0.42% and 0.08% respectively. Fish landing center-wise analysis of tuna catch shows that Tharuvaikulam, Therespuram, Thoothukudi Fishing Harbour and Kombudurai contributed 75.03%, 24.18%, 0.42% and 0.37% of the total catch respectively. The maximum CPUE was recorded for drift gillnet multiday fishing (454.22 Kg/day) during July 2016 and minimum (0.35 Kg/day) for trawl net single day fishing during November 2016. Maximum CPUE was observed for yellowfin tuna (267.24Kg/day) during July 2016 and minimum for little tuna (4.97 Kg/day) during April 2017 in large meshed drift gillnet. Length frequency distribution, growth parameters, mortality parameters and fishing pressure were studied for the four species of tuna by using FiSAT II software package. In the present study, the exploitation ratio (E) was obtained as 0.59, 0.55, 0.57 and 0.65 for the species T. albacares, K. Pelamis, E. affinis and A. thazard respectively. In the case of T. albacares the fishing pressure was observed the maximum on the length group of 65 cm, before its first maturity. Hence, the existing mesh size of large meshed drift gillnets needs to be increased to make the young T. albacares escape and allow to breed. Three tuna species namely K. pelamis, E. affinis and A. thazard showed a similar pattern of fishing pressure on the length group that is well above the length at their first maturity. In addition to the gillnets, the fishermen of Thoothukudi may be encouraged to go for deepsea long lining.ReprintItem Open Access Breeding biology of the spineless cuttlefish Sepiella inermis (Orbigly)(Indian J. Fish.,, 2002-03) NEETHISELVAN, N; V.K. VENKATARAMANI; N. RAMANATIHANStudies on the seasonal occurrence of maturity stages of Sepiella inermis revealed that this species is a prolonged breeder as mature and spent specimens were recorded almost round the year. Two peak spawning periods, one in November and another in March were observed. Mature animals were represented by a wider length range ruling out the possibility of semelparity. The gonodosomatic and nidamental gland indices increased during maturation. The females attained maturity earlier than males. Fecundity showed a significant correlation with dorsal mantle length. Cuttlefishes contribute substantially to the cephalopod fishery of Thoothukkudi (8'47' N,, 78"9' E), located in south east coast of India. Out of the three species of cuttlefishes, viz. Sepia pharaonis, Sepia aculeata and Sepiella inurmis, which form commercial fishery in this coast, S.inerrnis is notable for its year round occurrence.ThesisItem Open Access EVOLVING SERIAL COLLAPSIBLE FISH TRAP WITH UPGRADED MATERIALS AND FUNNEL DESIGNS(Fisheries College and Research Institute, Thoothukudi, Tamil Nadu Fisheries University, 2017) ARUN JENISH, D; NEETHISELVAN, N; SUNDARAMOORTHY, B; JAWAHAR, PA study on the comparative analysis of catch performance of two types of serial collapsible fish traps namely Type-1 traps and Type-2 traps was carried out. Funnels of four different shapes such as (i) Rectangular, (ii) Oval, (iii)Heart-in and (iv)Circular were fabricated with two different rear end opening perimeter of 560mm and 700mm so as to fit in Type-1 and Type-2 traps respectively. Two trap units were fabricated under each type of traps. Each trap unit consisted of six trap chambers so as to enable to fit four types of funnels each in triplicate. The main characteristic feature of the Type-1 traps was that it was made up of Galvanized steel tubes having 2.5 cm thickness. Further, the rear end funnel opening of Type-1 traps had smaller perimeter of 560 mm. Type-2 trap frames were fabricated with PVC rods of 2.5 cm thickness. Further, the rear end funnel opening of Type-2 traps had relatively a larger perimeter of 700 mm. The experimental fishing was carried out for six months from November 2016 to April Title :Evolving serial collapsible fish trap with upgraded materials and funnel designs Name : D.Arun jenish Degree : M.F.Sc. (Fisheries Engineering and Technology) Chairman : Dr.N.Neethiselvan Department :Department of Fishing Technology and Fisheries Engineering College :Fisheries College and Research Institute, Thoothukudi Year and University :2017, Tamil Nadu Fisheries University, Ngapattinam. 2017 at Mandapam fishing village of Ramanathapuram district of Tamil Nadu at the rate of 4 fishing trips per month. The traps were operated from a Vallam (a traditional craft of Thoothukudi origin) in fishing grounds three nautical mile off the coast of Mandapam (Lat: 090 14.141‟N; Long: 0790 09.433‟ E) keeping the total soaking duration of traps as 24 h. Significant difference could be observed with respect to catch rate of different species caught irrespective of the types of traps (P<0.01). The difference in shape of rear funnel opening was found to be responsible for the significant difference in the catch rate of the experimental traps(P<0.05). Significant difference could also be observed in the catch rates of both in Type-1 and Type-2 traps with respect to different months (P<0.01). The overall catch rate of Type-1 traps was about 2 times higher (13 Nos/ soaking day) than that of Type-2 trap (7 Nos/ soaking day). Epinephelus malabaricus was found to be the dominant species in Type-1 traps in terms of numbers; where as Acanthurus bleekeri was found to be the dominant species in Type-2 traps. Epinephelus malabaricus ranked first in terms of weight in both Type-1 and Type-2 traps. The traps fitted with the funnel having Oval shaped rear end opening performed better than traps fitted with other shapes of funnels both in Type-1 and Type-2 traps. Considering the Net returns, fitting all the 6 chambers of Type-2 traps with O1 funnel was found to be the best combination to get possible highest net return of Rs 55,011 for 25 fishing days using 30 Trap units per fishing trip.ThesisItem Open Access “FACTORS INFLUENCING THE BIOGENIC AMINE FORMATION IN SALT CURED FISHES OF TUTICORIN”(Fisheries College and Research Institute, Thoothukudi, Tamil Nadu Fisheries University, 2017-08-11) SURYA, T; JEYASEKARAN, G; JEYA SHAKILA, J; NEETHISELVAN, NThis study was undertaken to examine the quality of the commercial salt cured fishes of Tuticorin. The commercial salt cured fishes had moisture content ranging from 12.78 to 58.8%, water activity from 0.60 to 0.89, salt content from 1.0 to 23.4 % and TVB-N content from 20.47 to 389.54 mg/100g. Biogenic amine content was also examined for the samples using UPLC-TUV with newly developed method. Of the 50 samples tested 60 % of the commercial salt cured fishes had histamine exceeding prescribed limit of 20 mg/100g. The salt cured seerfish and sardine collected in November had higher halotolerant bacterial count of 6.49 and 5.69 log cfu/g, respectively. The halotolerant bacteria isolated from salt cured seerfish and sardine were S. arlettae, S. gallinarum, S. sciuri and S. lentus. Salinicoccus salsiraiae, Bacillus thuringiensis, B. megaterium, B. paralicheniformis, B. pumilus, B. licheniformis, B. safensis, Providencia alcalifaciens and Providencia vermicola. All the species under Bacillus had more ability to form cadaverine & histamine and less ability to form tyramine. Eventhough, the isolated Staphylococcus possessed the ability to form the important biogenic amines, it formed the cadaverine and tyramine at higher levels. Providencia alcalifaciens isolated from salt cured seerfish had the ability to form histamine and cadaverine. Providencia vermicola, Bacillus thuringiensis and were found to be the producers of histamine, cadaverine, putrescine and tyramine. This study also dealt with the development of best protocol for the salt curing of fish in whole & eviscerated forms after 0, 6, 9, 12 &15 h delayed process. Laboratory prepared salt cured sardines were also examined for quality parameters. Moisture content of laboratory prepared salt cured sardines of both the forms on the final day of drying ranged from 10.76 to 13.76 %. The low moisture content correlated well with the low halotolerant bacterial count on its final day of drying. Water activity of laboratory prepared salt cured sardines ranged from 0.73 to 0.85. The 15 h delayed salt cured whole sardines had higher histamine contents (156.827 mg/100g), cadaverine (405.984 mg/100g), putrescine (160.495 mg/100g) and tyramine (86.294 mg/100g) on the final day of drying. The delayed processing results in higher biogenic amine contents. Whole sardines had higher biogenic amines and halotolerant bacterial count than the eviscerated sardines. The TVB-N content of 15 h delayed whole and eviscerated salt cured sardines was 358.87 and 229.77 mg/100g, respectively, which were above the threshold level of 200 mg/100g. The cadaverine formation was several manifold higher than the other amines. The sardines processed up to 9 h delay yielded a satisfactory salt cured products with respect to biogenic amines and other quality parameters.ThesisItem Open Access STUDIES ON THE TRADITIONAL FISHING METHODS OF INLAND WATERS OF TAMIL NADU(Fisheries College and Research Institute, Thoothukudi, Tamil Nadu Dr.J.Jayalalithaa Fisheries University, 2015) MUTHUKUMAR, S; SUNDARAMOORTHY, B; NEETHISELVAN, N; SUKUMAR, DThe present study was conducted to document various traditional fishing methods and gears employed to capture inland fish species in freshwater systems of Tamil Nadu. Sixteen different fishing methods and fishing gears have been reported from Thirunelveli, Madurai, Theni, Dindigul, Coimbatore, Tiruchirappalli, Erode, Dharmapuri, Krishnagiri, Nagapattinam, Pudukottai, Thanjavur, Thiruvarur, Vellore, Cuddalore, Kanchipuram and Tiruvannamalai districts of Tamil Nadu. The reported gears were categorized under different groups of fishing gears such as traps, baskets, aggregating devices, dragged gear and barriers. Under the traps, Tholugu Pari, Iruvaai Pari, Ayirai Koodu, Paanai Pari, Kottu Pari, Vilaangu Koodu, Yeantha Pari, Thappai Pari and Moongil Pari were recorded. The basket type fishing gears such as Ootha and Katcha were reported in many districts. Fish aggregating devices such as Aaralkaththai and Kattu Fishing were found in some districts. Shar Fishing is a type of fish barrier reported from Thanjavur and Thiruvarur districts. Ayirai Valai and Kachaal Fishing were reported in different districts of Tamil Nadu. The traditional gears reported under this study were documented for their distribution, construction, operation, catch composition, seasons of operation and cost. Most of the traditional gears reported in Tamil Nadu were found to be constructed with locally available natural plant materials such as coconut leaflet sticks, split bamboo, Poolan sticks etc. These traditional gears of inland waters of Tamil Nadu are operated in the shallow waters of rivers, canals, channels, lakes, ponds and tanks and operation was found to be seasonal in nature. The CPUE, scope for upgradation and optimization of inland fishing gears were studied.