Reproductive studies on the short neck clam Paphia malabarica (Chemnitz) from Dharmadom Estuary, Kerala, India

Maturation and spawning of the short neck clam Paphia malabarica was studied from Dharmadom Estuary, in northern Kerala, India. The breeding season was from October to February, with peak spawning in November and December. Sexual activity commenced from March onwards and lasted till September. The peak somatic period was from February to April when more numbers of indeterminates appeared in the population. There was not much difference in the size at maturity (Lm) for females and males; Lm was estimated to be 20 mm for females and 22 mm for males. Chi-square test indicated that the sex ratio differed significantly (p<0.01) from the theoretical 1:1 ratio, only in the month of May. The abundance of mature clams showed positive correlation with salinity and negative correlation with temperature

New record of the stromateoid fish Psenopsis intermedia (Piontrovskiy, 1987) from Indian waters

The occurrence of Psenopsis intermedia off Malpe, in the Arabian sea, which is not recorded so far from the Indian waters is reported. The comparison of the mersitic and morphometric characters of the specimens with the holotype and paratype of the species is presented

Technologies for fisheries enhancement

Technologies for fisheries enhancemen

Note on Mercia opima, a venerid clam from Medha creek, Gujarat

The yellow shelled clam Mercia opima, locally known as "Dabla" (Fig. 2 & 3), is found abundantly along the sandy beds of the barmouth of the Medha river between Harshad and Miani. It remains buried almost 5 cm deep in the porous sand and usually occurs in pairs

गुजरात की संकरी खाडियों में खाघ शुकित्त पालन से रोज़गार

कृपया पूरा लेख पढे

Cephalopod fishery and population dynamics of Loligo duvauceli (Orbigny) off Saurashtra region, Gujarat

The fishery of cephalopods and some aspects of population dynamics of the Indian squid Loligo duvauceli from Veraval and Mangrol in Saurashtra region was studied for the period 1996-99. The average annual landing of cephalopods by trawl in Veraval and Mangrol were estimated at 3911t and 1030t respectively, which contributed 4.8 and 5.7% of the total fish landings in Veraval and Mangrol. Loligo duvauceli dominated the catch (58%) , followed by Sepia aculeata (19%), S. elliptica (19%), S.pharaonis (3%) and Sepiella inermis (1%). The length weight relationship was estimated for males and females of Loligo duvauceli as W= 0.109011 L 2.634609 and W = 0.314656 L 2.185796 respectively. The estimates of VBGF parameters were L! = 303mm and K= 0.98 year -1. The mortality rates values Z, M, F were 3.94, 1.94 and 2.20 respectively. The exploitation rate was 0.56. The present study shows that the resource is exploited above the optimum level and the effort has to be reduced for sustaining the resource for long term exploitatio

Conservation criteria and Red listed marine resources of India

Fish production in the country has increased from 5.65 million tonnes in 2000-2001 to 8.66 million tonnes in 2011-12, of which inland and marine sectors contributes to 5.29 and 3.25 million tonnes respectively. The growth rate in marine fisheries in recent years has been slow compared to inland fisheries. India is the second largest producer of fish in the worl

Pufferfish Lagocephalus inermis - an emerging fishery along Mangalore coast of Karnataka

L agocephalus inermis (Temminck & Schlegel, 1850) commonly known as smooth blaasop, belongs to the family Tetraodontidae and order Tetraodontiformes. This fish was considered as a menace by fishermen during the previous year (2006) as it caused damage to other species landed and the net

Studies on some aspects of biology and population dynamics of short neck clam Paphia malabarica chemnitz in Dharmadom Estuary North Kerala Southwest coast of India

Fisheries sector plays a vital role in the Indian economy. It addresses various issues like food and nutritional security, employment, livelihood support and socio economic status of fishing communities. The sector provides employment and income to over 5 million fishers and fish farmers, majority of whom live in over 3600 coastal villages, besides fishers hamlets along the major river basins and reservoirs in the country. The fish production in India registered an excellent growth during the past half century and reached 6 million t in the year 2002 from a meager 0.75 million t in 1950. The fishers primarily depend on fisheries in these waters for their livelihoods. The fisheries sector in India contribute to nearly Rs. 220 billion which is 1.4 % of the total national gross domestic products (GDP) and 4.6 % of agriculture GDP (Pillai, 2004), and hence it occupies a very important place in the socio-economic development of the country. The sector has been recognized as a powerful instrument to generate income and employment as it stimulates growth of a number of subsidiary industries and is a cheap and nutritious food besides being a foreign exchange earner. At the same time it is a means of livelihood for a large section of economically backward coastal population of the country. Indian fish production increased from 3.7 million tonnes in 1990 to 5.3 million tonnes in 1999 and ranks fourth in the fish production in the world. (Fishing Chimes, April 2006)

Allometric relationships of short neck clam Paphia malabarica from Dharmadom estuary, Kerala

Length weight relationship and other allometric relationships were studied for shortneck clam Paphia malabarica. Lengthweight and total weight-flesh weight relationship in males and females were significantly different (p <0.01). The rate of growth in all other relationship studied were not significantly different between sexes. In length- weight relationship it showed isometric growth and in length-width and length-depth it showed negative allometric growth. The determination coefficient (r2) was higher in length-depth than in length-width relationship indicating that the shell growth in depth is less variable than shell growth in width and negative allometry indicates that width and depth increase are inferior to length increase