Dr.S.N. Sethi

• BFSc MFSc(Dr. Hiralal Choudhary Gold Medal )PhD
• Principal Scientist at Central Institute of Freshwater Aquaculture

The demand for organically produced fish is becoming increasingly important, and consumers prefer other organic crops as a consensus on a healthy diet. To produce organic fish on a commercial scale, organically produced quality seeds are needed. However, uncertainty in the timeliness and quantity of seed supply is one of the major constraints in or...

Utilization of inexpensive oil cakes in fish diet formulations is essential to counteract problems related to the shortage of quality fish meal and the increase in prices of conventional fish feed ingredients like soybean meal, groundnut oil cake and mustard oil cake. This study determined the extent to which the low-cost sesame oil cake (SOC) coul...

Ornamental Aquaculture Field School is a new concept of extension approach where there is interaction among the farmers in a informal way, where they can express their problems and views freely.

Mutualistic symbiosis is a common phenomenon in nature. In this relationship, the porcelain crab is benefitting from the sea pen by being protected from potentially harmful predators (tiger shark, white tip reef shark, hammerhead shark, blacktip reef shark, green hump head parrotfish, napoleon wrasse and the cuttlefish) and it has a place to live....

Staphylococcus epidermidis has emerged as a major contributor of nosocomial infections across the world. With the increased rate of emerging resistant and previously undefined infectious diseases, there is a growing need to develop a novel vaccine possessing required immunogenic properties. The adopted reverse vaccinology approach identified "IMPNQ...

An experiment of 45 days duration to test the efficacy of the Vibrio alginolyticus as an immunostimulant was conducted in Marsupenaeus japonicus against white spot syndrome virus (WSSV) infection, considered as one of the serious pathogens of shrimps. The shrimps were fed with the experimental diets coated with different concentrations of bacteria...

The species Bursatella leachii was collected from the intertidal waters of Pulicat Lake. The study was carried out at controlled room temp. in glass aquaria's; the mating occurred in the form of unilateral copulating with chain formation. Only the first animal acted as receptor, the second and succeeding animals acted as donors. It releases the fer...

Stock assessment of the Indian squid Uroteuthis (Photololigo) duvaucelii off north Tamil Nadu coast from commercial trawl landings was studied during the period 2012-2016. The species is mainly caught by trawl net and the annual average landing of the species was 563.3 t contributing to 2 % to the total trawl landing along north Tamil Nadu coast. L...

Stock assessment of the Indian squid Uroteuthis (Photololigo) duvaucelii off north Tamil Nadu coast from commercial trawl landings was studied during the period 2012-2016. The species is mainly caught by trawl net and the annual average landing of the species was 563.3 t contributing to 2 % to the total trawl landing along north Tamil Nadu coast. L...

This study was to investigate the Genetic characteristic of ragged sea hare Bursatella leachii found in Indian water is similar to the species found in Mar Menor (SE Spain) water since pathways/ vector of species introduced into the world wide by the way of transportation activity (shipping activity such as ballast water, sedimentation, anchoring &...

Crescent Perch, Terapon jarbua is an important candidate species for brackish water ornamental and food fishes. This fish inhabits brackish water of much of the tropical and subtropical Indo-Pacific region on sandy bottom including estuaries. During December 2014, a fully matured female with average egg diameter of 450 μ along with two oozing males...

Two specimens of Aplysia fasciata were collected from Pulicat Lake, Tamil Nadu, at a depth range of 2 to 4 m (13º 26' to 13° 43' N latitude and 80º 03' to 80º 81' E longitude) by using a shore seine net in traditional fishing crafts. A literature review on the distribution of this species revealed that this is the first report of Aplysia fasciata f...

New records of Blue Ring Octopus, Hapalochlaena nierstraszi, adam 1938, from the bay of Bengal along the Chennai coast, Tamil Nadu, India

Betanoda virus was detected in wild caught milk fish fry (Chanos chanos) exhibiting Beta noda virus was detected in wild caught milk fish fry (Chanos chanos) showing typical clinical symptoms and signs of viral nervous necrosis (VNN)/ Viral encephalopathy and retinopathy, (VER) from the bank of Matchlipattinam, Andhra Pradesh, India during March 20...

Application of chemicals for monitoring if Vibrio outbreaks can enhance resistance in mangrove (Rhizophora apiculata) leaves extract was tested against bioluminescence disease-causing Vibrio harveyi bacteria. An inhibitory zone of 12 mm was observed at 350µg/mL The growth of V. harveyi was decreased from 0.783 to 0.533 (OD600) as compared to contro...

This is an Open Access Journal / article distributed under the terms of the Creative Commons Attribution License (CC BY-NC-ND 3.0) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. All rights reserved. Ecotoxicological effects of mixture pesticides are studied less on aquatic...

An attempt was made to investigate the parasitic infection in wild Asian sea bass, Lates calcarifer along Bay of Bengal coast, India. Several numbers of fish caught from Kasimedu fishing harbour were examined for the presence of parasites. In all the fish examined, gills were infected with a single species of copepod, Lernanthropus latis Yamaguti (...

The effect of L-tryptophan (TRP) supplemented diets at levels of 0, 0.5, 1.0, 1.5 and 2% on cannibalism, survival and growth performance of Asian seabass, Lates calcarifer (Bloch, 1790) fry was evaluated. Thirty days old seabass fry (mean weight: 0.31±0.16 g) were reared for 45 days in a recirculating aquaculture system. Results of the present expe...

Specimens of Bursatella leachii Blainville, 1817 were collected from Pulicat Lake along the East Coast of India up to a depth range of 1 m and maximum number of this species were recorded at 20 cm depth (13°33′57″N 80°10′29″E) of sandy soil bed . A thorough literature survey on this species revealed it to be a first report from this region. The pre...

Ecological investigation of species diversity and abundance of birds was conducted from May 2014 to February 2015 in and around North Orissa University Campus. Transect count and point count methods were used to investigate the abundance of birds. Observation was conducted by periodically walking along the study area early in the morning and late i...

Occurrence of philometra lateolabracis (philometridae) in the subcutaneous caudal fin region of sciaenid fishes of Bay of Bengal Large Marine Ecosystem (BOBLME), Tamil Nadu (India) Present study consists the prevalence of philometrid nematode, Philometra lateolabracis infections in two species of Sciaenid fishes along the Madras coastal water, Bay...

Reproductive biology of the Monkey river prawn (Macrobrachium lar) was studied in the Rangat river, Andaman Islands, during 2007 to 2009, with the aim of determining the male: female ratio, maturity cycle, spawning seasons and the fecundity in those ecosystems. During 18 months period, 2078 individuals were collected, with a male: female ratio (M/F...

Present investigation provides information on the availability of Black-margined nudibranch which were caught by trawl gears operated along the Karaikal coast of south India at a depth of around 150-200 m during 16 October 2012. Specimens were identified as Doriprismatica atromarginata. This species has not been reported earlier and therefore consi...

Common Parasitic diseases and their control measures in brackishwater finfish hatchery

Highly popular and delicious fish of Kerala (India), pearlspot, Etroplus suratensis is known for its ability to tolerate wide range of salinity, omnivorous feeding behavior. Present report documents the occurrence and management of Caligus rotundigenitalis in brackishwater pond meant for culture demonstration of pearlspot in Gujarat, (India). A bra...

Two specimens of Dolabella auricularia were collected from Kayalpatinam, Gulf of Mannar at a depth range of 20 to 50 m (8° 33ʹ 02.23ʺ N and 78°24ʹ 04.77ʺ E) by using a drift gill net in a traditional fishing crafts. A literature review on the distribution of this species revealed that this is the first report of Dolabella auricularia from the Gulf...

The present investigation provides information on the availability and distribution of the side-gilled slugs, Pleurobranchus mammillatus which were caught by trawl gears operated along the Tuticorin cast of South (8 40 782 N and 78 15 469 E) India at a depth of around 15-20 m during 18 September 2013. The specimens were identified as Pleurobranchus...

Increase in mean sea surface temperature (SST) over the years is the primary indicator of ocean warming; which is likely to impact fish growth, reproduction and migration in the ocean. As a prelude to understanding changes in biotic communities along the Tamil Nadu coast of India, the trend in SST along the Tamil Nadu coast was assessed over a peri...

Increase in mean sea surface temperature (SST) over the years is the primary indicator of ocean warming; which is likely to impact fish growth, reproduction and migration in the ocean. As a prelude to understanding changes in biotic communities along the Tamil Nadu coast of India, the trend in SST along the Tamil Nadu coast was assessed over a peri...

Increase in mean sea surface temperature (SST) over the years is the primary indicator of ocean warming; which is likely to impact fish growth, reproduction and migration in the ocean. As a prelude to understanding changes in biotic communities along the Tamil Nadu coast of India, the trend in SST along the Tamil Nadu coast was assessed over a peri...

The stomach content of the freshwater prawn Macrobrachium lar from the inland water bodies of Andaman and Nicobar Islands were analysed in relation to size, sex and season during the period from January to December 2008. Feeding habits of M. lar were studied using the index of preponderance and feeding intensity methods. Mainly organic detritus, su...

The present study reports the prevalence of philometrid nematode, Philometra lateolabracis infections in two species of Sciaenid fishes along the Madras coastal water, Bay of Bengal during December, 2008 to July, 2012. Out of total 295 sciaenid fishes examined, Otolithes ruber and Pennahia macrophthalmus showed 70 % & 32.5% of parasitic prevalence...

along t h e Chennai Coast ~uthom O n 12-08-2012, a rare occurrence of Blue ring octopus (Hapnlocht aksm*phq N.RW-wGFwm ehsMiul *a ' S d W ~ ~ R ~ W ~ Tbi&m&H)ghIW R.A*mv iEmQ m i -% < S m 6 i k ~ r ~ w @ w m a ~ --9-Focal Points at a Glance of Blue Ring Octopus . or reduced. Poison from Hapnlochlaenrr s p -has proven to be fatal to ,humans, Ocean a...

Present study consists the prevalence of philometrid nematode, Philometra lateolabracis infections in two species of Sciaenid fishes along the Madras coastal water, Bay of Bengal during December, 2008 to July, 2012. Out of total 295 sciaenid fishes, examined, Otolithes ruber and Pennahia macrophthalmus showed 70% & 32.5% of parasitic prevalence on...

The morphometric relationships of endemic species of the palaemonid prawn Macrobrachium lar collected from the rivers of Andaman Islands, India, were studied. A total of 57 specimens (27 and 30 males and females) were examined using 8 morphometric measurements. Significant difference in the pattern of growth was observed in males and females with r...

Sea slugs were caught in the trawl net operated off north Chennai at a depth of around 100-150 m during early hours of 24 June 2011. The specimens were classified and identified as Kalinga ornata and deposited in the Marine Biodiversity Museum of the Central Marine Fisheries Research Institute, Kochi (Accession code: DB. 40.1.1.). Although sea slug...

The giant tsunami of December 2004 not only damaged the physical infrastructure of the islands but devastated the agriculture and allied sectors along with the associated livelihood opportunities. An investigation was carried out to assess the damage caused by tsunami to the farming community of Andaman and Nicobar Islands and the impact of the sch...

This study was carried out to investigate the extent of parasitation of copepod pennellidae on King Mackerel (Scomberomorus commerson), along South-East coast of India during September 2009.This is the first report from this region and the infection is discussed in relation to biological parameters. Fifty to sixty numbers of parasites were recorded...

The giant tsunami of December 2004 not only damaged the physical infrastructure of the islands but devastated the agriculture and allied sectors along with the associated livelihood opportunities. An investigation was carried out to assess the damage caused by tsunami to the farming community of Andaman and Nicobar Islands and the impact of the sch...

Parasitic fish diseases constitute one of the most important problems in fisheries sector. Among fish parasites, cymothoids are obligatory parasites, infesting mostly commercially important fishes. They are protandric hermaphrodites and blood suckers, living on the skin, gill filaments, or in the mouth of the fishes. These parasites retard growth a...

The stomach content of the freshwater prawn Macrobrachium lar from the inland water bodies of Andaman and Nicobar Islands were analysed in relation to size, sex and season during the period from January to December 2008. Feeding habits of M. lar were studied using the index of preponderance and feeding intensity methods. Mainly organic detritus, su...

Macrobrachium lar (Fabricius, 1798) is a freshwater prawn species of Andaman and Nicobar Islands (A&N Islands) inhabiting streams, rivers, lakes and ponds. Length-weight relationships of this species collected from selected streams and ponds during the year 2008 were estimated. A total of 238 specimens in the size range 60-167 mm in total length (1...

The study was carried out to investigate the incidence of isopod parasites in clupeids, with special emphasis on the Indian pellona fish, Pellona ditchela . Two species of isopods, Joryma hilsae and Joryma sawayah were found infecting this fish. The isopods of the genus Joryma are typical Indo-Pacific genus, found infecting the gills of marine fish...

Sea slugs were caught in the trawl net operated off north Chennai at a depth of around 100-150 m during early hours of 24 June 2011. The specimens were classified and identified as Kalinga ornata and deposited in the Marine Biodiversity Museum of the Central Marine Fisheries Research Institute, Kochi (Accession code: DB. 40.1.1.). Although sea slug...

During the period 1998-2007, an annual average of 20,898 t of marine resources was landed by trawlers at Kasimedu, Chennai, by expending a mean annual effort of 35,608 units. The annual catch during 1998-2007 showed fluctuations between 12182 t in 2005 and 35,838 t in 2002. The mean annual effort of 13.21 lakh h in 1998 dropped down to 5.08 lakh h...

Increase in sea surface temperature (SST) over the years is the primary indication of global worming. Temperature in turn affects other ocean parameters like salinity, pH, dissolved oxygen etc. All these factors have a synergistic effect on the biota, ranging from microscopic plankton to large fishes and marine mammals. As a prelude to understandin...

Detection of white spot syndrome virus (wssv) in brood stock of tiger shrimp, penaeus monodon and other crustaceans of Andaman waters Survey had been convened off South & North Andaman Seas to find out the presence of WSSV. In the present investigation the WSSV was detected in wild caught P. monodon brood stocks. This virus were also detected in ot...

Traditional Indigenous knowledge has over the years played a significant role in solving several major social-ecological problems including those related to climate change and variability. People living close to nature often observe the circumstances around them and are the often the first to identify and adapt to any changes. The appearance of cer...

An experiment of 45 days duration to test the efficacy of the Vibrio alginolyticus as an immunostimulant was conducted in Marsupenaeus japonicus against white spot syndrome virus (WSSV) infection, considered as one of the serious pathogens of shrimps. The shrimps were fed with the experimental diets coated with different concentrations of bacteria...

Traditional Indigenous knowledge has over the years played a significant role in solving several major social-ecological problems including those related to climate change and variability. People living close to nature often observe the circumstances around them and are the often the first to identify and adapt to any changes. The appearance of cer...

DThc main sou rce of Bactcrial contamination of Estuary waters are domestic waste water and sewage discharge. In this prcscnt im"cstigation, Green Mussels werccollectcd from three different stations ofChennai Coast -Ennore, Royapuram and Muttukadu. The mussels were degutted and bacteria were isolated using selective and non·sclective agar medium an...

eli 't)..1 to 1..0 \ ~' .. Abstract Three large sized Macrobrachium species-. viz. Macrobrachium rosenbergi;, M malcolmsonii and M gangelicum are available in Indian riverine systems. The study on the seed production and gTowout of th~se" species are being carried out to develop technologies for commercial application. Hence, the ~owtedge on compar...

Outbreak of diseases and health related problems due to vibriosis are common in brackishwater aqua-culture and mariculture. However, studies on vibriosis in the fresh water prawn are not well documented. In the present study, biochemical changes under induced stress condition in Indian river prawn Macrobrachium mal-colmsonii was studied. Prawn juve...