Record size black marlin, Makaira indica (Cuvier, 1832) landed at Bhimilipatnam, Andhra Pradesh

A gigantic black marlin, Makaira indica measuring 4.3 m in length and weighing around 450 kg was landed at Bhimilipatnam beach landing centre and brought to Visakhapatnam Fishing Harbour

Landing of Alopias pelagicus (Nakamura, 1936) at Visakhapatnam

Two specimens of the pelagic thresher shark Alopias pelagicus (Nakamura, 1936) were landed at Visakhapatnam Fishing Harbour on 28.06.2011. One specimen was male (Fig. 1) and the other was female. The male pelagic thresher shark measured 940 mm and weighed 900 g. The female measured 829 mm (caudal fin tip was absent) and weighed 750 g. The specimens were characterised by large eye size and very long upper lobe of caudal fin. According to Compagno (1984) and Fisher and Bianchi (1984), the pelagic thresher is ovoviviparous, with at least two young, born at a length greater than 96 cm

Marine Fisheries Census 2005 and 2010 of Andhra Pradesh: Comparison

Andhra Pradesh is one of the major marine fish producing states along the east coast of India.It has a coast line of 974 km bordering in the east with 9 coastal districts viz., Srikakulam, Vizianagaram, Visakhapatnam, East Godavari, West Godavari, Krishna, Guntur, Prakasam and Nellore. There are two major fishing harbours at Visakhapatnam and Kakinada from where bulk of total trawl catch (about 70%) is landed. The fishery is contributed by mechanised, motorised and traditional sectors. Socio-economic evaluation of the fisherfolk population, information on livelihood activities, education and professional status are the prerequisites for proper planning and implementation of programmes for their upliftment and social empowerment. Marine Fisheries Census 2005 and 2010 provides needed information for Government agencies, NGO’s and other stakeholders

Fishery, biology and stock assessment of spotted seer, Scomberomorus guttatus (Bloch & Schneider) off Andhra Pradesh

The fishery, biology and stock of the spotted seerfish, Scomberomorus guttatus (Bloch & Schneider) along Andhra Pradesh was studied during 2012-2014. The annual average landing of spotted seer during the period along Andhra coast was 2,614 t. Major contributors were trawlnets-1,104 t (42.2%) and gillnets-950 t (36.3%). Catches were higher during August-December. Length-weight relationship varied significantly between males, females and indeterminates. Growth was isometric in males and allometric in females and indeterminates. Overall sex ratio was 1:1.87. Length at first maturity was 38.9 cm. Peak spawning was observed during November-April. Higher Gonadosomatic index coincided with periods of peak spawning. Mature ovaries contained both maturing (0.41 mm-0.70 mm) and matured (0.71 mm-0.90 mm) ova. von Bertalanffy growth equation was Lt = 71.98 [1-e -0.23 (t + 0.0722)]. Natural mortality, fishing mortality and total mortality were 0.54, 0.49 and 1.03. Exploitation ratio was 0.48. Annual total stocks, biomass and Maximum Sustainable Yield were 8,546 t, 5,335 t and 2,747 t. A minor increase in yield and yield/recruit is possible by increasing the present level of fishing by 20%

Fishery, reproductive biology and stock status of the Indian mackerel Rastrelliger kanagurta (Cuvier, 1817), landed along the north-east coast of India

The fishery, biology and stock status of Indian mackerel, Rastrelliger kanagurta (Cuvier, 1817), landed along the north-east coast was studied during 2011-2014. The average annual catch was 52,206 t. Catch was more or less equally contributed by trawlers, gillnetters and seiners with average catch rates of 3.05 kg h-1, 22.74 kg unit-1 and 140.09 kg unit-1 respectively. Catch was positively influenced by wind speed and negatively by sea surface temperature and precipitation. Growth in males was isometric, while it was allometric in females and indeterminates. Females outnumbered males in the commercial catches. Length at first maturity varied between 18.32 and 18.86 cm. Peak spawning season was during July - October and February - April. Relative fecundity was 567.51 ova per gram body weight. von Bertalanffy growth equation obtained was: Lt = 27.72 [1-e -1.2 (t + 0.023)]. Length at first capture and life span estimated were 12.78 cm and 2.48 years respectively. Natural mortality, fishing mortality and total mortality were 2.06, 3.69 and 5.75, respectively with an exploitation rate of 0.64. Peak recruitment was found to be during September-October. Maximum sustainable yield and yield per recruit were 40,675 t and 14.74 g respectively which were obtained by increasing the present fishing effort by 20%, but at the increased fishing effort, the increase in yield was a meager 0.53%, which indicates that the present level of fishing can be continued

Trophodynamics of Nemipterus japonicus (Bloch, 1791) in the trawl landings along the north-east coast of India

The trophodynamics of Nemipterus japonicus (Bloch, 1791) along the north-east coast of India was studied during 2012-2015 based on specimens collected from trawl landings at Digha, Paradeep (northern region), Visakhapatnam and Kakinada (southern region). Crustaceans were the preferred prey with index of relative importance (IRI) of 50% in the northern region and 42.4% in the southern region. Among crustaceans, Oratosquilla dominated in both the regions followed by crabs and several species of penaeids and nonpenaeids. Finfishes ranked next in importance (IRI% of 32.1 in northern region and 39.9 in southern region) and included Stolephorus spp., silverbellies, Coilia sp., other clupeids, Apogon spp., mackerel, sardines, eels, priacanthids, Bregmaceros sp. and sciaenids. Along northern region, in juveniles and preadults, the diet comprised chiefly of crustaceans (IRI% of 72.27 and 52.76), followed by finfishes (IRI% of 15.37 and 27.65). In the southern region, adult fishes exhibited higher preference for finfishes (IRI% of 47.5 to 62.8). Feeding intensity was low throughout the year with close to half (48.23% in northern region and 43.67% in southern region) of the fishes exhibiting empty or trace stomach conditions which increased with an increase in age and size of fish. High similarity of 75.54% in the northern and 84.19% in the southern region was recorded in the diet contents of smaller and moderate sized adults. Annual and seasonal mean similarity in the diet components between the regions was 69.9 and 53%. Prey contents in juveniles between both the regions exhibited a similarity of 59.5%, while preadults and adults recorded similarities of 62.7 and 68.2% respectively

निज़ामपट्टणम और मछलीपट्टणम की समुद्री मात्स्यिकी में कार्बन पदचिह्न्न

कृपया पूरा लेखा पढ

Reproductive biology of Nemipterus japonicus (Bloch, 1791) in the trawl grounds along the north-east coast of India

The reproductive biology of Nemipterus japonicus (Bloch, 1791) along the north-east coast of India was studied during 2012-2015 based on samples from the trawl landings at Digha, Paradeep, Visakhapatnam and Kakinada. Adults dominated the landings. Significant contribution by females was observed in most months of the year. Size at first maturity for females was 15.1 cm. Peak spawning season was during August to February and September to March in the northern and southern regions. Maturity and gonado-somatic index (GSI) were found to correlate well with sea surface temperature (SST). Fecundity increased with length and weight and varied from 13,176 to 1,30,798. Ova diameter distribution indicated the species to be a multiple/batch spawner

Carbon footprint in life cycle of marine fisheries at major fishing harbours of Andhra Pradesh, India

Contribution of marine fisheries at all stages of its life cycle, to climate change during 2012-2013 was studied by determining their carbon footprint at four major fishing harbours/fish landing centres in Andhra Pradesh viz., Visakhapatnam, Kakinada, Nizamapatnam and Machilipatnam . Functional unit was 1 kg of marine fish to the consumer. Fuel and electricity consumption per kg of marine fish was on an average 0.43 l and 0.24 kWh at Visakhapatnam, 0.41 l and 0.15 kWh at Kakinada, 0.52 l and 0.26 kWh at Nizamapatnam and 0.48 l and 0.21 kWh at Machilipatnam. Mechanised catches contributed 80-85% of the total fuel burnt and 79-90% of the total electricity consumed. The harvest phase (88-93%) burnt the most fuel, while the post-harvest phase (51-62%) contributed the most to the electricity consumption. Emission intensity per kg of marine fish was 0.34 kg C and 1.26 kg CO2 in Visakhapatnam, 0.31 kg C and 1.16 kg CO2 in Kakinada, 0.41 kg C and 1.50 kg CO2 at Nizamapatnam and 0.37 kg C and 1.37 kg CO2 at Machilipatnam. Fuel and electricity consumption and emission intensity was high for mechanised landings and low for motorised landings. The highest emissions were recorded in the harvest phase at all the places. Energy consumption and subsequent emissions can be reduced by making suitable modifications to the diesel engines, speed of operation and to the craft and propeller designs