Observations on the prawn fishery of Mangalore coast during 1970-1980

The annual yield of prawns in the Mangalore coast showed considerable fluctuations. The MSY is estimated to be around 1800-1900 t, at an effort level of 28,000 boat-days. The best catch of 3644.6 t and CPUE of 120 kg were obtained during 1973-74. Thereafter, the catch and CPUE declined almost continuously coupled with a reduction in the average size of prawns, even though there was a substantial increase in effort, indicating depletion of the stock. Metapenaeus dobsoni and Parapenaeopsis stylifera contributed to around 85% of the annual avearge catch of prawns. The annual mean length of males and females of M. dobsoni and M. affinis and males of P. stylifera decreased considerably during the present period of observation compared to earlier years. In the case of females P. stylifera, however, the decrease was only marginal

Trawl fishery of the mid-shelf region off Mangalore coast

Trawl fishery over the mid-shelf region off Mangalore coast was studied during 1979/80,1987/88. Details of craft and gear employed, the nature and extent of fishing ground and the changing pattern of fishins are dealt with. There was an eight-fold increase in fishing effort from 4,132 unit days in 1979•80 to a maximum of 34,758 unit days in 1984•85. The annual production rose from 527 t in 1979-80 to a maximum of 10,327 t in ' 1986-87, showing a twenty-fold increase. The catch rate, however, showed an increasing trend initially reaching a peak value of 299 kg in 1981 -82 and declined thereafter only to register another peak of 335 kg in 1985-86

Temporal patterns in biodiversity and health status of reef corals of Palk Bay

A detailed study aimed at identifying the changes in biodiversity, live coral cover as well as health status of the Palk Bay Reef corals was carried out over a period of 4 years. The live coral percent cover was measured using Line Intercept Transect method at fixed sites in the reefs of Palk Bay in 2008 in order to study and make comparisons with the surveys conducted in 2004. Substantial decrease in live coral cover was observed over the last four years with a live coral cover of 13.65% and 12.9% in Velapertumuni and Kathuvallimuni Reefs respectively. Acropora cytherea and Favites abdita were the dominant and abundant species respectively in Velapertumuni Reef with relative abundance values of 21.08 and 10.85 respectively. However, in Kathuvallimunai Reef, Acropora lamarcki was found to be the most abundant species with a relative abundance value of 12.68. All other species belonged either to common/uncommon species status. Variations in community structure were also noticed in both the reefs. Even though, the total live coral cover was found to be reduced, the increased recruitment of fast growing species like Acropora has contributed to a fair diversity as indicated by the diversity indices. Studies on the disease prevalence in hard corals indicated more incidences of diseases in massive corals as compared to branching corals. Disease conditions such as brown band disease, porites ulcerative white spot syndrome and pink line syndrome/porites pinking were recorded

5th International Symposium on Cage Aquaculture in Asia Book of Abstracts

The 5th International Symposium on Cage Aquaculture in Asia (CAA5) is being organised by the Asian Fisheries Society and the ICAR-Central Marine Fisheries Research Institute (CMFRI), in association with the Asian Fisheries Society Indian Branch, from the 25th to 28th of November 2015 at Kochi, India. The event will cover an array of topics related to cage culture under the broad headings of Marine Production Systems, Inland Production Systems, Breeding and Seed Production, Nutrition and Feed, Health and Environment Management and Economics, Livelihood and Policies

5th International Symposium on Cage Aquaculture in Asia Programme Guide

The 5th International Symposium on Cage Aquaculture in Asia (CAA5) is being organised by the Asian Fisheries Society and the ICAR-Central Marine Fisheries Research Institute (CMFRI), in association with the Asian Fisheries Society Indian Branch, from the 25th to 28th of November 2015 at Kochi, India. The event will cover an array of topics related to cage culture under the broad headings of Marine Production Systems, Inland Production Systems, Breeding and Seed Production, Nutrition and Feed, Health and Environment Management and Economics, Livelihood and Policies

On 'dol' net prawn fishery of Bombay during 1966-76

The best prawn catches of 2330.4 t at Versova were in 70-71 and 1917.5 t at Sassoon Docks were in 1968-69. The peak fishery was generally during October- December and March-May. The fishery was supported mainly by seven species of penaeids and three species of non-penaeids; the latter contributing up to 80% of the catches obtained in Dol nets

Monsoon prawn fishery by 'Matabala' along the Mangalore coast—a critical study

The article presents a report on a critical study about 'Matabala' also known as 'Disco net' (small version of purse seine net made of nylon), a gear used along the Mangalore coast during monsoon period. It was considered that the net was much more size specific to catch large sized prawns

Current status of biodiversity and health of the coral reef ecosystem of Palk Bay

The coral reefs in Palk Bay run parallel to the shore between longitudes 79°17’ E and 79°8’ E, at the latitude 9°17’ N. It lies in an east-west direction and is about 200 to 600 m away from the shore at different places at a depth of 1 to 5 m

Experiment on polyculture in a brackish water fish farm in Dakshina Kannada (Karnataka)

The Karnataka state is having about 5000 ha of brackish water areas suitable for fish culture. The results of these experiments indicated that fishes like mullets, milk fish and Sillago sihama and the prawn, P. indicus, could be cultured advantageously in the brackish water fields of the Mulky region. Since the fields are found to be very productive, no artificial or supplementary feeding is required for the culture of these fishes

A Novel Signal Processing Method for Friction and Sliding Wear

© 2021 by ASME. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1115/1.4052063This current study proposed a new computationally efficient and comparatively accurate algorithm for calculating both static and dynamic coefficients of friction from high frequency data. Its scope embraced an application in a real-time friction-based system, such as active braking safety systems in automobile industries. The signal sources were from a heavy-duty reciprocating dry sliding wear test platform, focused on experimental data related to friction induced by stick-slip phenomena. The test specimen was a polytetrafluoroethylene (PTFE)-coated basalt/vinyl ester composite material, tested at a large scale. The algorithm was primarily aimed to provide scalability for processing significantly large tribological data in a real-time. Besides a computational efficiency, the proposed method adopted to evaluate both static and dynamic coefficients of friction using the statistical approach exhibited a greater accuracy and reliability when compared with the extant models. The result showed that the proposed method reduced the computation time of processing and reduced the variation of the absolute values of both static and dynamic frictions. However, the variation of dynamic friction was later increased at a particular threshold, based on the test duration.Peer reviewe