आँध्रप्रदेश की वेलापवर्ती मात्स्यिकी संपदाएं

आँध्रप्रदेश की वेलापवर्ती मात्स्यिकी संपदाए

Assessing the impacts of climate change on marine fisheries of Karnataka and identifying regime shifts

Climate related regime shifts, namely the rapid reorganization of marine ecosystems from one relatively stable state to another, have been reported from several parts of the world, and found responsible for the fluctuations of major fisheries. Time series on ocean-atmosphere parameters together with time series on plankton and/or fish abundance has been extensively used for identifying regime shifts in the oceans from several parts of the globe

Bull trawl operation banned along Karnataka coast to reduce indiscriminate exploitation of juvenile fishes

Mangalore Fisheries Harbour is one of the major marine fish landing centres of Karnataka, contributing more than 40 % of the total marine fish landed in the state. Bull trawling or pair trawling is done along the coastal districts of Karnataka with peak operations during the post-monsoon (September to November) period. The pair trawls target pelagic and semi-pelagic schooling fishes, like carangids, scombroids, clupeids, pomfrets, squids, etc. and the catch mainly consist of juveniles, including those of high value fishes

Benefit sharing in the value chain of Indian mackerel Rastrelliger kanagurta in Karnataka: A policy perspective

Harvest and post-harvest activities in a multispecies multifleet unregulated marine fishery is highly complex involving a large number of intermediaries. The real economic benefits from fishing are often skewed in the hands of a few intermediaries in the value chain. Equitable distribution of benefits is an essential component for ensuring sustainable exploitation and management in the context of ecosystem based management of marine fisheries. The present study analysed the market linkages and benefit sharing by different stakeholders in the value chain of Indian mackerel in Karnataka, south-west coast of India. Results of the study indicated that in terms of individual benefits, export processing and canning sectors in Karnataka grabbed a significant share in the Indian mackerel value chain and suggests a revisit into the policy on export incentives for Indian mackerel, in order to ensure equitable distribution of benefits among the stakeholders as well as to protect the interests of domestic consumers

Cutting remains from Fish Cutting Centres - A feed source for fish farming in estuaries of Karnataka

Demonstration of small scale cage culture of finfishes in coastal waters initiated by Mangalore Research Centre of ICAR- CMFRI during 2008- 2009 period has resulted in large scale adoption of the technology (Fig.1). The fish production through finfish culture in small cages in Uppunda village of Udupi district in Karnataka increased from an estimated 1.2 tonnes (t) during the 2009-10 period to 14 t in 2013-14. The success of cage farming in estuarine areas which was launched as a pilot project in Uppunda village of Udupi district has extended to other estuaries

Cephalopod fishery of Visakhapatnam - trend and present status

Andhra Pradesh contributes nearly 8% to the total marine fish production of India. The cephalopods contribute a little over 1% to the total marine fish landings of Andhra Pradesh. In Andhra Pradesh, cephalopods are landed by large trawlers (12-14 m, 98/110 HP), known as sona boats and smaller trawlers (9.5-10 m, 68/90 HP). Total cephalopods landed during the period 2000-2010 was 23629 t and the total effort was 37399153. Cephalopod production increased from 1011 t in 2000 to over 2300 t in 2002. Thereafter there was a declining trend up to 2006. In 2006-2007, the production increased to over 2500 t. In 2008, there was a drastic decline. However, there has been an increasing trend in production in 2009-2010 (Fig. 1). Cephalopods contributed 0.53% in 2000 and 1.6% in 2010, to the total marine fish landings of Andhra Pradesh (Fig. 1). The annual average cephalopod production for the period was 2148 t, forming an average 1.04% of the total marine fish landings in Andhra Pradesh

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

Fishery, reproductive biology and stock status of the largehead hairtail Trichiurus lepturus Linnaeus, 1758 off Karnataka, south-west coast of India

Ribbonfish fishery along Karnataka Coast is supported by a single species, the largehead hairtail Trichiurus lepturus. The species is exploited mainly by trawls and gillnets and during 2007-2012, production from Karnataka fluctuated between 11090 and 28845 t. The asymptotic length (L∞), growth coefficient (K) and age at zero length (t0) for T. lepturus were estimated as 116.75, 0.65 yr-1 and -0.171 respectively. Recruitment showed a bimodal pattern with peaks during March to June and August to December. Total mortality, fishing mortality and natural mortality were estimated at 3.32 yr-1, 2.41 yr-1 and 0.91 yr-1 respectively. The length at first capture (L50) and size at first maturity (Lm50%) were estimated at 54.91 cm and 55.4 cm respectively. Mean length in the catch was 67cm indicating that the fishery was sustained by mature fishes. However, the current exploitation rate (E) is 0.73 which is little higher than E0.1 (0.70). As ribbonfish is an r selected, tropical species with a very high fecundity, SSB of 20% would help to maintain the fishery at sustainable levels and hence it is advisable to reduce the effort by 20%. Thompson and Bell bioeconomic analysis showed that the present level of exploitation can maintain the revenue from the fishery at economic level

किशोर मछली पकड़ का अभिशाप (The bane of juvenile fish catches)

Juvenile fishes are defined as immature fishes that have not yet had the opportunity to replenish the fish population by spawning. The length at which 50% of the fishes of any particular species mature varies among species and is called its Length at First Maturity (Lm). When juveniles are caught in large numbers there is an economic loss as fishermen get very low prices for the small sized young fish as compared to the larger adults