Growth of kiddy shrimp, Parapenaeopsis stylifera (H.Milne Edwards,1837) along Saurashtra coast

Age and growth of kiddy shrimp, parapenaeopsis stylifera was investigated during September, 1995-May,2000 from Veraval Fisheries Harbour. The average annual catch of the species during 1996-1999 was 1,940 t, which formed about 45% of the total penaeid shrimp landing. The species was caught throughout the fishing season, with major peak during October-January. The total length ranged from 56 to 108 mm in males and from 56 to 140mm in females

Biology and exploitation of the crucifix crab, Charybdis (Charybdis) feriata (Linnaeus, 1758) (Brachyura: Portunidae) from Karnataka coast, India

Charybdis feriata supports trawl fishery of Karnataka coast and the entire catch is landed by multiday trawlers operating beyond 30 m depth zone. The highest landing was observed during 2003 (142 t). Fishing season for the species extend generally from September to June but peak fishing season of the species was during December-June. Size range observed in the fishery was 46 to 170 mm in males and 26 to 155 mm in females. Mean size ranged from 66 mm to 80 mm. Test of homogeneity of the sex ratio (χ2 test) for the years, 2007-2009 showed that proportion conform to 1:1 ratio. Studies conducted on reproductive stages of the species show that the species is a continuous breeder with two peak breeding season, one during October–November and another during May-June. Size at maturity (50%) of females was estimated at 70 mm carapace width and age at 50% maturity was about 7 months. Carapace width-weight studies showed that males were heavier than females of similar size. By von Bertalanffy’s growth plot, it was estimated that males and females reach 101mm, 99 mm (CW) respectively at the end of first year and reach 142 mm and 137 mm respectively in two years. Stock assessment studies of the species was conducted using sex pooled data for the period 2007-2009 so as to formulate management suggestions. The Z, M and F values estimated for the species were 6.04, 1.76 and 4.28 respectively. The exploitation ratio (E) was 0.71. MSY was estimated as 131t against the present annual average yield of 124 t. From ‘Thompson and Bell yield prediction analysis’ it is seen that any additional 10% effort from the present level will yield only less than 10% additional catch, indicating that increasing the effort for better catch of the resource will not be economical and it is suggested that restricting the catch to MSY level (131 t) will be the suitable management option for the sustainability of C. feriata fishery from the coast

Cage farming of finfishes in estuaries

The support and expanse of marketing network and advancement of preservation technologies solved long standing problems marketing in domestic as well as international market. In view of its high demand in internal and international market, more and more entrepreneurs are getting interested in the farming of food fishes. Innovations in cage culture technology and its success has drawn the attention of policy makers into giving thrust on food fish culture. Those who have invested huge amount in shrimp culture installations along the coastal areas are also showing interest in switching over to food fish farming following these developments and setback in shrimp culture

Unprecedented trash fish landing at Mangalore Fisheries Harbour

Trash fish landing at Mangalore Fisheries Harbour is mainly used for fish meal. The earlier practice was to take the trash to sandy areas near the sea and sun dry them. In the case of the catch brought by single day trawlers, the usual practice was to separate commercial groups from the entire catch and to sun dry the rest. During the year 2008, the average price of trash fish was Rs. 4/kg. Low value by-catch of multi-day operating vessels, pertaining to the last two days are brought to the shore for sun drying

Technologies for fisheries enhancement

Technologies for fisheries enhancemen

'Dol' net fisheries of the Saurashtra coast

In this communication an attempt has been made to give an overall view of the 'dol' net fishery of the S a u r a s h t r a Region of Gujarat. The method of 'dol' net operation, fishery, conditions and other factors prevailing in the three major landing centres namely Nawabunder, Rajpara and Jaffarabad are dealt with based on regular observations carried out during September 1995 to August 1997. 'Dol' nets are fixed bagnets which are tied to the poles or ropes anchored at the sea bottom and kept afloat by floats.In the Saurashtra coast heaps of stones are used as anchors. Nawabunder landing centre has a well constructed concrete jetty projecting into the sea. At Rajpara around 240 'dol' net units were under operation out of which 100 numbers were three netters and the rest two netters. At Jaffarabad about 280 'dol' netters were under operation out of which 60 were four netters. Bombay duck formed more than 50 % of the catch in all the three centres except in Nawabunder (44 %). The non-penaeids, formed more than 15 % of the catch at all the centres. Among the non-penaeids, Acetes spp. was the dominant one. These species alone formed about 15 % at Nawabunder. At Rajpara t h i s group formed about 13 % and at Jaffarabad about 11 %. The gold spotted anchovy (Coilia dussumeri) is also an important group landed in 'dol' nets. This group formed around 8 % In the dol net catches at all the centres. The peak season for Bombay duck was October to December at all landing centres and catches were poor during the monsoon months. But for non- penaeids and gold spotted anchovy the main season was March to May, and the catches were more during 1996-'97 than 1995- '96. The main season for the gold spotted anchovy was between December and March

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कृपया पूरा लेखा पढ

Food and feeding of the ridgeback shrimp, Solenocera choprai Nataraj, along Karnataka coast

Though Solenocera choprai is an important shrimp resource from Karnataka coast, information on food and feeding of the species is lacking. ‘Index of preponderance’ method was used to study the food and feeding habit of the species. The food contents found were decapod crustaceans, unidentifiable mass, ‘fish remains’, molluscan shells, polychaete worms, sand, foraminiferans and small crustaceans (other than decapods) in the decreasing order of abundance. In adults, annual index of preponderance for decapod crustaceans, detritus and ‘fish remains’ were 43.82, 19.27 and 11.17 respectively. In females, the major component of the food was decapod crustaceans with indices above 40. Annual feeding intensity of adult S. choprai was 28.88% with the highest value of 54% observed in February and lowest value from June to December. The change in monthly feeding intensity of the species is found to be influenced by the disturbances in the sea bottom caused by upwelling. Feeding intensity was the highest in immature females (40.71%) followed by spent females

Trawl Fishery of Juvenile Fishes along Mangalore- Malpe Coast of Karnataka and its Impact on Fish Stock

The article presents the quantitative and seasonal variation in percentage of juveniles in the commercial trawl fishery of Mangalore and Malpe in 2006 and discusses the possible impacts of juvenile fish fishery on fish stock in terms of quantity and value. Twenty finfishes and five shellfishes were identified in which considerable quantity of juveniles were caught, and the juvenile fishery is making notable impact on adult fishery. To understand the impact of the fishery of juveniles in a holistic manner, the species of juveniles caught by trawlers are categorized into three groups: I) both juveniles and adults are caught mainly by trawls II) juveniles of the species are caught in trawl, whereas their adults are targeted by gears other than trawl and III) juveniles of the species are caught by trawls regularly, but their adults are rarely caught or not figured in the fishery of the region. Detailed studies on the length-frequency distribution of important species were carried out to find juvenile percentage by weight, number, and months of abundance of juveniles

Indigenous Technical Knowledge and ancient proverbs of the coastal fisher folk of Kerala and their implications

The paper attempts to study the Indigenous Technical Knowledge of the fisher folk offishing villages. Maruvakkad and Mallipuram belonging to Chellanam and Elankunnapuzha Panchayats. respectively of Palluruthy and Vypeen Block, Ernakulam. The Traditional knowledge and proverbs penaining to the fishing community of these villages were collected and the scientific rationale for the same was studied