At least 60 species of crustaceans are farmed experimentally or commercially, mostly in the tropics and subtropics where species maturation times are shorter than in temperate climates. Over 50 species are kept by aquarists, and several, especially Artemia spp., are widely used as live foods for rearing fish and aquatic invertebrates. However, there has been far less application of genetics in crustacean farming than in finfish and mollusc farming, and very few crustaceans can be regarded as domesticated.
Length frequency data of six sciaenids (Johnius macrorhynus, J. vogleri, Otolithes cuvieri, J. sina, Pennahia macrophthalamus, J. dussumieri) were collected from shrimp trawlers at New Ferry Wharf and Sasson Docks landing centers off Greater Mumbai (India). Growth parameters of these species were analyzed via modal progression analysis using Bhattacharya's method. Natural mortality (m) was estimated using Cushing's formula. Comparison of growth parameters was done using the 0' index.
Earlier studies and works done in the first phase of the shrimp quality support project revealed that gender discrimination is widespread in the value chain of shrimp sub-sector. As such the SQSP 2 has the objective to provide training on gender development to the different stakeholders of the shrimp value chain to aware and sensitize them to employ more women to achieve gender equality and mainstream gender in the sub-sector.
This paper discusses the status of shrimp farming and evaluates the level of profitability, the relative competitiveness in the production and trade of shrimp, and the technical efficiency of shrimp production in the major shrimp-producing countries of Bangladesh, China, India, Indonesia, the Philippines, Sri Lanka, Thailand, and Vietnam. The analysis is based on primary and secondary information collected by the WorldFish Center and its partner research institutes, and supplemented by a review of the existing literature.
Mortality rates of reef fishes are typically very high in the first few weeks after settlement. Capture and release of reef fish before or shortly after settlement may provide an opportunity to increase survival. Increasing survival at this stage could be a sustainable way of increasing fisheries resources. visual censuses of juvenile grunts (Haemulidae) during settlement pulses from January to March 2001 and July to September 2001 in Tortola, British Virgin Ilands were used to estimate local post-settlement mortality rates on a back-reef, seagrass/sand halo area.
In Vembanad Lake and its confluent rivers (Kerala, India), the catches of Macrobrachium rosenbergii (de Man) were reported to have dwindled to a mere 39 t in the 1980s from average landings of 300 t during the 1960s. This decline is due to the impact of a number of human interventions affecting the ecosystem and, hence, the stocks of M. rosenbergii. Monitoring of landings in 1994-1995 and 1995-1996 indicates an improvement in catches. This paper discusses the reasons for the decline and revival in stocks and suggestions for their replenishment.
We examined the potential for producing the large numbers of sandfish (Holothuria scabra) needed for restocking programmes by co-culturing juveniles with the shrimp Litopenaeus stylirostris in earthen ponds. Our experiments in hapas within shrimp ponds were designed to detect any deleterious effects of sandfish on shrimp, and vice versa. These experiments showed that a high stocking density of juvenile sandfish had no significant effects on growth and survival of shrimp.
South-East Asia has traditionally been the global centre of production of tropical sea cucumbers for Chinese markets. Early research into culture methods took place outside this region, notably in India, the Pacific region and China. However, recent investment in Holothuria scabra (sandfish) culture has led to some significant advances within this region. The Philippines and Vietnam have been at the forefront of recent efforts, with involvement from substantial national programs and local institutions as well as international donors and scientific organisations.
The Southwestern coastal zone of Bangladesh is agro-based and one of the world’s most populous, poverty-stricken and food-insecure regions, with high vulnerability to climate change. Shrimp aquaculture rapidly expanded in this tidal floodplain but shrimp is highly susceptible to disease, has less contribution in local consumption, and its profitability depends on international market prices, leading the demand for improving the farming system.
Fisheries are an important source of protein and employment for Sri Lanka’s population. The declaration of the Exclusive Economic Zone (EEZ) in 1976 gave the country a water area larger than its land area. The coastal fisheries resources consist of small and large pelagic fish, demersal and coral reef fish, invertebrates, shrimps and crabs. The small pelagic fish contribute 70% of the catch from coastal waters with an estimated annual production of 152 752 t in 1997.