An intra-farm study of production factors and productivity for shrimp farms in Bangladesh: an index approach

The production characteristics of shrimp farming in Bangladesh are reported based on a panel of farms for the period 1998 to 2002. The data allow for a profit decomposition based on the Törnqvist index, where differences in relative profits can be explained by differences in productivity, prices, and pond size. The indices indicate that pond size is the most important factor in determining profitability and that the largest farms are the most profitable. However, productivity measured as profit per hectare is only weakly positively correlated with pond size.

Impacts of harmful algae on seafarming in the Asia-Pacific areas

Seafarming to produce human food has recently intensified, particularly in the Asia-Pacific region. Disastrous impacts of harmful phytoplankton blooms, however, have been experenced during the past 20 years. In extreme cases, these render shellfish and finfish toxic or cause massive fish and shrimp kills. Problems from marine algae in the region include paralytic shellfish poisoning, diarrhetic shellfish poisoning, ciguatera, tetrodotoxin poisoning, fish kills and tainting of fish and shellfish.

Harvest of settlement stage reef fish for small-scale grow-out or stock enhancement: a feasibility study on the family Haemulidae

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.

Growth studies of sciaenids from Mumbai waters using the Bhattacharya method.

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.

Growth and emigration of white shimp, Litopenaeus vannamei, in the Mar Muerto Lagoon, Southern Mexico.

Microcohorts of white shrimp, Litopenaeus vannamei, were sampled with a cast net at fortnightly intervals in the Mar Muerto Lagoon, Southern Mexico. Shrimp recruited to the lagoon throughout the sampling period (January to August 1993). Mean growth rates of microcohorts ranged from 0.21 to 1.21 mm total length (TL) per day. Juvenile shrimp mainly between the sizes of 70 to 80 mm TL emigrated from the lagoon. Growth and the onset of emigration appeared to be related to water salinity.

Gendered monitoring report: shrimp quality support project 2, implemented by WorldFish Center, supported by USAID

The Shrimp Quality Support Project 2 has started in December 2006 and completed in September 2007. A baseline survey has been conducted to find out the situation existed for the shrimp farmers at bench mark and at the end of intervention: a monitoring survey was conducted to observe the progress and impact made by the project. Different reports were generated on the findings of the surveys.

Factors determining spawning success in Penaeus monodon Fabricius.

Spawning success in relation to the size of spawner, clumping of eggs, percentage of spawning and frequency of spawning was studied in Penaeus monodon collected off Tamil Nadu, India. The results indicated positive correlation between the size of spawner and the fecundity and hatching percentage, but not the start of hatching. Hatching characteristics were influenced by clumping of eggs or abortive spawning; the greater the clumping, the longer the time taken for hatching, resulting in a lower hatching percentage.

Domestication of crustaceans

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.


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