समुद्री मात्स्यिकी संपदा का प्रबंधन

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Targeted trawl fishery for moontail bullseye, Priacanthus hamrur off Mangalore for surumi production

Moontail bullseye, Priacanthus hamrur has been forming a part of the trawl fishery off Mangalore, caught from a depth beyond 100 m ever since deepsea trawling started off the coast. This is not a preferred edible species in Karnataka and was not a species considered for targeted fishery

Unusual catch rates of cuttlefish in a multiday trawler

Cuttlefish is one of the commercially important group of cephalopods caught by multi-night trawlers along the coast of Karnataka. The catch rate of cuttlefish in multiday trawlers varies from <5 kg/haul during December-April period to 50-300 kg/haul during the peak fishing season in August- September

Observations on the landing of Odonus niger at Mangalore

The redtoothed triggerfish (Odonus niger) of the family Balistidae is a reef associated species landed by trawl nets operated along the Karnataka coast. This species forms dense aggregations in inshore waters and were not targeted till recently due to their poor market demand. The triggerfish shoals are intentionally avoided by the trawlers and the incidental catches are either discarded or brought ashore when there is available deck space for storage. Such small quantities landed are auctioned along with the miscellaneous fish groups. Some interest was evinced on this species by the fish meal traders due to limited availability of raw materials during the year 2008

Resurgence of whitefish in trawl landings of Mangalore

Lactarius lactarius, commonly known as false trevally is exploited mainly by trawlers from the inshore waters (5-30 m depth) along the Karnataka coast. Bottom-set gillnets and purseseines also land minor quantities of whitefish, besides the indigenous gears operated during monsoon. The average annual production of false travelly from multiday trawls operated along Mangalore coast remained at 416 t during the period from 2000 to 2002. A declining trend in the fishery was noticed since the year 2000 consequent to reduction in catch rates and the production reached an all-time low of 117 t in 2004. Thereafter, the catch rates in multiday trawl improved significantly from 0.09 kgh–1 in 2004 to an annual average of 0.33 kgh–1 in 2008 (Fig. 1). During the year, 50% of the annual whitefish landing was observed in October- November months, when the catch rates increased from 0.6 to 0.8 kgh–1

समुद्री स्पंजों में सूक्ष्मजैविक विविधता

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तटीय कर्नाटक की समुद्री पखमछली विविधता-एक परिदृश्य

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कर्नाटक के नदिमुखों में पिंजरा मछली पालन

Estuarine Cage farming in Karnatak

ANTI-BIOFILM EFFICACY OF PLECTRANTHUS AMBOINICUS AGAINST STREPTOCOCCUS PYOGENES ISOLATED FROM PHARYNGITIS PATIENTS

ABSTRACTObjective: The objective of the study was to evaluate the anti-biofilm efficacy of Indian medicinal plant Plectranthus amboinicus extracts against thebiofilm forming Streptococcus pyogenes isolated from pharyngitis patients.Methods: The plant extracts (methanol and ethyl acetate) were screened for their preliminary phytochemical components. The solvent extract withhigher phytochemical yield was subjected to quantitative analysis using the Gas Chromatography-Mass Spectrometry (GC-MS) technique. In vitroanalysis of the anti-biofilm study was performed using the Minimal Inhibitory Concentration (MIC) assay, biofilm inhibitory concentration assay,growth curve analysis, anti-bacterial activity, and light microscopy analysis.Results: The methanol extract showed the highest phytochemical content. GC-MS analysis of the methanol extract showed a total of thirty two phytocompounds among which most of the compounds were medicinally important. MIC assay showed that the inhibition of test pathogens was at anaverage concentration of 2 mg/ml. The agar well diffusion method elucidated that at sub-MIC the methanol and ethyl acetate extracts did not inhibitthe growth of the test pathogen. Growth curve analysis was carried out at the concentration sub-MIC, in which the solvent extracts did not show anysignificant inhibition on the planktonic cells, whereas the biofilms of the test pathogens were significantly reduced and were dose dependent at subMIClevelsas confirmed bythe lightmicroscopicanalysis.Conclusion: These preliminary results indicated that the methanol extract of P. amboinicus leaves consisted of pharmacologically active componentsand could be used as an anti-biofilm agent at minimal concentrations thereby successful preventing the formation of biofilms.Keywords: Plectranthus amboinicus, GC-MS, Anti-biofilm activity, Light microscopy, S. pyogenes

Seasonal and annual variations in fish and macro-crustacean fauna in the shore seine fishery of Karwar, Karnataka

Karwar coast of Karnataka is known for sandy beaches, and these beaches apart from providing the aesthetic beauty, are supporting traditional fishermen of the coast for finding their livelihood avenues. Traditionally the beaches of Karwar is known for shore-seine operations, known as rampani fishery. Rampani nets were made of coir ropes and the nets were operated from October to March, exclusively targeting mackerel and sardines