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ReprintItem Open Access Analysis of Design Features of Fish Trawls and Shrimp Trawls of Thoothukkudi Coast(ANALYSIS OF TRAWL DESIgN, 2003) Neethiselvan, N; Brucelee, GThe investigation deals with the comparison of body ProPortions of fish trawls and coastal shrimp trawls of Thoothukkudi coast with each other and with those of a standard FAO fish cum shrimp trawl. Significant variations could be noticed between fish trawls and coastal shrimp trawls of Thoothukkudi coast with respect to Parameters viz. length of bottom wing, breadth of top bosum, breadth of bottom bosum, breadth and length of second belly as evidenced from low percentages of overlapping (<25%). The deviations observed in certain morphometric measurements of fish and coastal shrimP trawls from that of standard FAO fish cum shrimp trawl design stressed the need for improving the design features of the existing trawls of Thoothukkudi coast. The study suggested to increase the length of bottom wing and to reduce the belly breadth, belly depth, breadth of top and bottom bosum in fish trawls. Irrespective of the q?e, all trawls invariably had the cod end mesh size of 20mm. The study recommends fitting of square mesh panel of 30-mm mesh size in the cod end of fish and shrimp trawls of Thoothukkudi coast to exclude juvenile fishesReprintItem Open Access Antibiotic Resistance Patterns of Escherichia coli and Salmonella from Environmental Samples of Thoothukudi CoastChrisolite, B.; Sugumar, G.The incidence and antibiotic rqsistance pattern of E. croli and Saltrll.:lwlla from water, beach sand and fish collected from four fish Ianding centres of Thoothuktrdi were studied. Presence of E. coli was confirmed in 90%, 92./. and 797o of watet beach sand and fish samples .respectively, while Salnronclla was detected in 25% of water and sand samples and 77Yo of fish samples. The isolates rl'ere tested against fifteen antibiotics by disc diffusion method. tlfi.le ;jl ihe 5 .lll: isolates r\'ere resistant to bacikacin, erythromycin and rifampicin, none of the isolates was resistant to ampicillin, chloramphenicol and sulphafurazole Among Saln,tonella isolates, all were resistant to bacitracin and most were resistant to ampicillin, colibtin, erythromycin and rifampicin. None of the Salnronella isolates was resistant to bhl6ramphenicol, ciprofloxacin and norfloxacin. Muliiple antibiotic resistance (MAR) index was higher than 0.2 in all strains of E. coli arrd Salmonelln revealing that they might have orlgihated from high-risk sources of contamination such as humans.ReprintItem Open Access Bacterial incidence in water and sand at fish landing sites along the Thoothukudi coast, Tamilnadu(Fisheries College and Research Institute,Thoothukudi, 2005-06) Chrisollte, B; Sugumar, G; Velayutham, P; Felix, NQuantitative and qualitative analysis o( bacterial flora of samples of water and beach sand collected from four fish landing sites of Thoothukudi was done for one year from June 2003 to May 2004. Although the bacterial counts varied widely in water and sand samples from Thirespuram landing centre, Fishing harbour, South landing centre and Port beach landing centre, there was no marked seasonal variation. There was no significant relationship between heterotrophic bacterial density and physicochemical parameters (P> 0.05). The dissolved oxygen and ammonia levels varied considerably between landing centres indicating the extent of pollution. Quantitative analysis showed dominance of Gram positive over Gram negative bacteria in all samples except in sand samples from Thirespuram landing centre.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.ReprintItem Open Access Comparative Fishing Efficiency of Lobster Traps(Fishery Technology, 2001) Balasubramanian, A; Kathavarayan, E; Neethiselvan, NFishing efficiency of lobster traps relies on various factors like design, shape and material of the trap and bait used. investigations on suitable design for lobster trap was attempted using six different designs such as rectangular with synthetic webbing, rectangular with steel wire, hemispherical, circular, semi-cylindrical and trapezoidal. The fishing efficiency of the traps differed significantly (p<0,01). Semicylindrical trap performed well by trapping 53 numbers of lobsters in 30 fishing operations.ReprintItem Open Access DETERMINATION OF OPTIMUM MESH SIZE FOR GILL NET TO EXPLOIT THE LONG TAIL TUNA,THUNNUS TONGGOL (BLEEKER)(Cheiron, 2002-12) D.Jude; N.Neethiselvan; P.Gopalakrishnan; G.SugumarThunnus tonggol, a coastal tuna popularly called long tail tuna forms an important fishery in Thoothukkudi coastal waters from June to September and are caught in gill nets with the mesh size ranging from 6.0 to 13.5 cm. The fishery is constituted by the length group 300mm to 575 mm The present study deals with the optimization of mesh size to capture the mature fishers of commercial value. The gill net mesh size of 10.64 cm. is optimum for exploiting the T. tanggol of size 426 - 575 mm from Thoothukudi waters.ReprintItem Open Access Distribution of luminescent vibrio harveyi and their bacteriophages in a commercial shrimp hatchery in South India(ELSEVIER, 2008-05) Chrisolite, B; Thiyagarajan, S; Alavandi, S V; Abhilash, E C; Kalaimani, N; Vijayan, K K; Santiago, T CLuminescent Vibro harveyi is a natural microflora of marine and coastal water bodies and is associated with mortality of larval shrimp in penaeid shrimp hatcheries. It is also known that the bacteriophages occur virtually in all places where their hosts exist. ln this study, distribution of luminescent V.harveyi and the bachtcriophages affecting these hosts was examined in a commercial Penaeus. monadon hatchery during three shrimp larval production cycles. Including a cycle affected by luminescent bacterial (LB) disease outbreak. Out of a total 1195 samples drawn from sea water source sand filter water nauplius, zoca, mysis and coast larvel rearing tanks, maturation and spawning tanks, Artemia hatching tank and algal culture tanks processed using conventional microbiological techniques, 21.4% of the samples harbor luminescent bacteria. during the larval production cycle affected by LB disease(LBD), luminescent V.harveyi could be recovered from 50% of the hatchery samples, whereas during luminescent bacterial disease free larval production cycle(LBDF) , these bacteria could be recovered from only about 9% of the samples. The predominant source of luminescent bacteria was the brood shrimp and there bearing tanks in maturation and spawning facilities.73% of the maturation and 80% of the spawning tank water samples harbor LB during LBD, Whereas only 20% and 32% of the maturation and spawning tanks respectively harbored LB during LBDF. LB could be isolated from 17% of the water samples in tanks from nauplius stage onwards with increasing counts that subsequently lead to LB diseases. Bacteriophages affecting the luminescent V.Harveyi could be isolated from as many as 36% (21% and 43% of the samples analysed during LBDF and LBD respectively) of a total of 181 water sample drawn from various sources in the hatchery using 27 luminescent v.Harveyi hosts by agar overlay Technic. The maturation tank water samples where found to be the predominant source of bacteriophage, followed by spawning tank water samples as observed with the LB sixty five bacteriophages, 13 during LBDF and 52 during LBD were isolated which were group in to 7 types based on their plaque morphology. The study has indicated that the brooders maturation and spawning facilities in the shrimp hatchery are the main source of luminescent v.Harveyi and there bacteriophages and that occurrence of LB even in low counts during early larval stages can possibly lead to development of LB disease despite presence of bacteriophages in the larval rearing tanksReprintItem Open Access Effect of antibiotics on the gfowth and maturation in goldfrsh (Carassius auratus)(Fisheries College and Research Institute, Thoothukudi, Tamilnadu Dr.J.Jayalalitha fisheries University, Nagappatinam, 2000-12) B. AHILAN; M.J.PRINCE JEYASEELANThe investigation was aimed at determining the effect of antibiotics on the growth and maturation of goldfish. The fishes were stocked in rectangular cement tanks and fed with artificial feed incorporated with antibiotics (virginiamycin and oxy'tetracycline) at three different concentrations. Among the doses tested for virginiamycin 50 ppm treatment showed highest response for both maturation and growth. The mean weight increment for individual fish was observed to be 4.409 g. In oxy'tetracycline treatment 150 ppm gave positive result for total weight gain of the fishes.ReprintItem Open Access Effect of biofilter on the environmental parametersand growth of goldfish (Carassius auratus)(Fisheries College and Research Institute, Thoothukudi, Tamilnadu Dr.J.Jayalalitha fisheries University, Nagappatinam, 2004-07) B. AHILAN; M.J.PRINCE JEYASEELANThe investigation was aimed at determining the effect of biofilter on the environmental parameters and growth of goldfish. The goldfish were reared in the flowthrough circular cement cisterns connected with biofilter unit and without biofilter. The important environmental parameters were estimated for a period of two months. The water pH and DO levels showed diurnal variation. The mean gross fish production was higher in the tank fitted with biofilter ( 29tg /5m3)than the tank without biofilter ( 2609 / 5m3)'ReprintItem Open Access Effect of cobalt chtoride and vitamin Bu on the growth and gonadal maturation of goldfrsh Carassius auratus(Fisheries College and Research Institute, Thoothukudi, Tamilnadu Dr.J.Jayalalitha fisheries University, Nagappatinam, 2001-12) B. AHILAN; M.J.PRINCE JEYASEELANThe investigation was aimed at determining the effect of vitamin BD and cobalt chloride on the growth and maturation of goldfish. The fishes were stocked in rectangular cem*ent tanks and fed with artificial feed incorporated with vitamin B12 and cobalt chloride at three d.ifferent concentrations. cobalt chloride incorporated at Z.b ppm gave positive results both for gonadal development and growth' Among the doses-test"d fo. vitamin Br, the 25 ppm concentration had shown highest response for both maturation and growth.ReprintItem Open Access EFFECT OF FORMULATED DIETS ON THE GROWTH AND SURVIVAL OF GOLDFISH (SARASSIUS AURATUS) FRY(Fisheries College and Research Institute, Thoothukudi, Tamilnadu Dr.J.Jayalalitha fisheries University, Nagappatinam, 2000-04) B. AHILAN; M.J.PRINCE JEYASEELANDeb with 20, 30, ard 4070 protein level were formulated and prepared. Fifteen day old fry were stocked in da$ic troughs at densities of 10 and 20 fry/L. The feed with 40% crude protein showed better performance under the stocking density of 10 fry/L followed by 30 and 20 % protein diets. Fry reared at the higher stocking density(20/L) showed relatively better fish biomass production, btrt individual size increment was better with fry stocked at 10/L, on termination of the 30-day experiment.ReprintItem Open Access Effect of livefood organisms on the growth and gonadal maturation of goldfish (Carassius auratus)(Fisheries College and Research Institute, Thoothukudi, Tamilnadu Dr.J.Jayalalitha fisheries University, Nagappatinam, 2003-03) B. AHILAN; M.J.PRINCE JEYASEELANThe investigation was aimed at determining the effect of livefood organisms on the growth and maturation of goldfish.Artemia.fed,fishes recorded highest mean weight gain. The individual mean weight gain of a fish per day was recorded to be 0.0439 for adult goldfish fed with Artemia,0.0259 for the earthworm fed fishes and 0.023g in control. Growth rate was almost double in Artemia. fed frshes than control. The highest GSI values for both sexes were also recorded in Artemia fed fishes followed by those fed with earthworm.ReprintItem Open Access Effect of protein sources on growth, survival, feed conversion and protein utilization in fry of red tilapia (Oreochromis niloticus)(Indian J. Fish, 2002-09) N. NEETHISELVAN; D. MANIKANDAVELU; G. INDRA JASMINE; V. K. VENKATARAMANIFeeding experiment conducted to determine the protein requirement of red tilapia (Oreochromis niloticus) revealed a significantly (P<0.01) higher weight gain when fed with 35% protein diet than those with 25 and 3070 protein, irrespective of the protein sources used. Weight gain of fish fed with 40% dietary protein did not differ significantly (P>0.01) from those fed with 35%, protein. However, the feed conversion efficiency and protein efficiency ratio of the animals fed with 35 and 40% protein diet varied significantly (P<0.01) revealing the optimum protein requirement offred tilapia in tho range of 35-40%. While fish fed with freshmeal based diets recorded good survival rate at all protein Levels, ensilage based feeds recorded poor survival rate at lower protein levels viz. 25 and 30%. On the basis of specific growth rate, feed conversion efficiency and protein conversion ratio, fish ensilage based diets were on par with that of fishmeal based diets, suggesting fish ensilage as an alternative source of protein in the feeds of red tilapia.ReprintItem Open Access Effectiveness of Fish Aggregating Devices in Freshwater Reservoir Fishery(2002) N. Madhavan; N. NeethiselvanTwo types of bottom set Fish Aggregating Devices (FADs), one of pyramidal shape and another of semi-prismatic shape were constructed using used tyres having a total outer surface area of 60 m2. They were tested for their aggregating efficiency in an artificial fresh water reservoir stocked with freshwater carps such ii catla (Catla catla), rohu (Labeo rohita), mriga) (Cirrluims mrigala) and silver carp (Hypopthalnictitys molitrix) The gill net catch around FAD-s and in non-FAD sites showed significant difference. Pyramidal FAD of 1'6 m height with tyres arranged in vertical orientation attracted more of surface feeders such as catla and silver crap compared to semi-Prismatic FAD of 1.3 m height with tyres arranged in horizontal pattern. the gill net catch around pyramidal FAD was significantly higher than that of semi prismatic FAD. The use of pyramidal FAD to improve catch per unit effort of gill netting in perennial reservoirs of the country, is suggested.ReprintItem Open Access EFFECTS OF DIFFERENT PIGMENT SOURCES ON COLOUR CHANGES JUVENILE CARASSIUS AND GROWTH OF AURATUS(Fisheries College and Research Institute, Thoothukudi, Tamilnadu Dr.J.Jayalalitha fisheries University, Nagappatinam, 2001-02) B. AHILAN; M.J.PRINCE JEYASEELANThe investigation was aimed at determining the effects of different pigment sources on colour development and growth juvenile goldfish. Four pigment sources were tried: Shrimp head meal , dried drum stick leaves dried curry leaves and turmeric powder. these pigments were added to basal diet at 10 ,5,5 and 5% respectively and fed into the goldfish for five weeks. fish feed with curry leaves, drumstick leaves, turmeric powder, and shrimp head meal showed better color development than the fish feed with basal diet. Growth was stimulated by shrimp head meal and inhibited by turmeric powder.ReprintItem Open Access Evaluation of the Effect on seasonal trawl Fishing Ban on Fish catches along the Chennai Coast(MKK Publicarion, 2006) E. KATHAVA.RAYAN; C. K. MUKHERJEE; N, NEETHISELVANThe Present study evaluates the effect of 45 days seasonal ban on trawl catch along the Chennai coast, Tamilnadu. The CPUE from commercial trawler, which was carried out before seasonal ban (June-August 1999) was compared with the CPUE in trawling done 4 years later (June-August 2001). Sampling was based on 15 hauls from 3 depth strata, viz., 10-50.51-100, 101-150 m before and after the seasonal ban Records of catch data from 15 hauls before seasonal were taken from commercial trawler's catch log book. Subsequently, 15 hauls were made between June and August 2003 from the same trawler. Eleven commercially important targeted species (nine finish, one crustacean and one cephalopod) were used for comparison. The average total catch of selected species was increased by 37% .The catch increment was from 7% in sciaenid to 72% in silver bellies after 4 years of implementation of seasonal trawl ban. Fishery management strategics based on seasonal trawl ban may be useful in areas where demersal trawl targeting multi species.ReprintItem Open Access FEEDING HABITS OF SQUIDS OF THOOTHUKKUDI, SOUTH EAST COAST OF INDIA(CHERION, 2000-12) N. Neethiselvan; V.K. VenkataramanilThe investigation on the feeding habits of squids of thoothukkudi waters revealed that they fed mainly on shrimps in their early phase of the life and switched over to fish in the later phase. Cannibalism was; found to persist in all the three species of squids studied. Occurrence of relatively a higher portion of shrimps and other crustaceans in the gut content of Sepioteuthis lessoniana rersealed the oientation of this animal more toutards the sea bottom than Loligo duvauceli and Doryteuthis sibogae.ReprintItem Open Access GilInet selectivity studies for fishing frigate tuna, Auxis thazard Lacepede (Perciformes/Scombridae) in Thoothukkudi(Tuticorin)waters, southeast coast of India(2002-12) D. Jude; N. Neethiselvan; p. Gopalakrishnan; G. SugumarAuxis thazard from commercial fishery in Thoothukkudi coastal waters from June to October in big meshed drift gillnets with the mesh size ranging from 60 to 100 mm. The fishery is mainly constituted by the length group)75-500 mm. The Present study deals with the estimation of mesh size to capture the commercially significant length-group (326-400 mm) of A.thazard and its enmeshing pattern in gill nets with two different mesh sizes. the-optimum of mesh size for the exploitation the commercial significant size group of A. thazard from Thoothukkudi coastal waters is estimated as g4 mm. As the Length at first maturity of this species in Thoothukkudi coast varied from 300 to 310 mm, the nets with propose mesh size would reduce growth and recruitment over fishing of A. thazard in this coast and allow for spawning before first capture.