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.

A method to estimate the stock-recruitment relationship of shrimps.

A procedure is proposed by which recruit numbers and parental biomass of shrimps stocks can be derived, given a series of catch-per-effort data and estimates of a few ancillary variables. In the Gulf of Thailand, shrimp recruitment decreased with decreasing egg production, but increased with decreasing total (mainly fish) standing stock. The net result of these counteracting effects was an overall increase in shrimp recruitment, attributable to a greatly reduced prerecruit mortality.

Salinity preference of two diatoms and their growth performance in three prepared and two alternative on-farm media sources

Salinity and preferred nutrient composition of <i>Chaetoceros affinis</i> and <i>Skeletonema costatum</i> were tested. Salinity was tested at 12, 16, 23, 28, and 32 ppt. Three compositions of nitrogen (N), phosphorus (P), and potassium (K) and two on-farm low-cost alternative media sources, cow urine (CU) and hatchery waste water (HWW), were tested to find the suitable NPK ratio and to determine the efficacy of the on-farm media respectively.

Experimental evaluation of co-culture of juvenile sea cucumbers, Holothuria scabra (Jaeger), with juvenile blue shrimp, Litopenaeus stylirostris (Stimpson).

The co-culture of juvenile sea cucumber Holothuria scabra (Jaeger), or ‘sandfish’, with juvenile blue shrimp Litopenaeus stylirostris (Stimpson) was tested by growing groups in co-culture and monoculture for 3 weeks in tanks with enriched sand substratum. Feedwas supplied on trays, accessible only to shrimp. Survival of shrimp and sandfish was high in all treatments (73-100%).

Shrimp disease management using bioactive marine secondary metabolites: an eco-friendly approach

Vibriosis caused by opportunistic and secondary bacterial pathogens is still a serious disease problem in aquaculture of the black tiger shrimp Penaeus monodon. Attempts were made for controlling shrimp bacterial disease using Marine Secondary Metabolites (MSMs). Findings indicated that the MSMs of seaweed Ulva fasciata and Dendrilla nigra are effective for controlling shrimp bacterial pathogens.

Growth, mortality and recruitment of commercially important fishes and penaeid shrimps in Indonesian waters.

Estimates of von Bertalanffy growth parameters were derived through application of the ELEFAN I program to lengthfrequency data from 52 stocks and 36 species of commercially important bony fishes from Indonesian waters, and to 9 different cohorts of a stock of penaeid shrimp (Penaeus merguiensis) from the Arafura Sea. Derived quantities such as total, natural and fishing mortality estimates, as well as selection and recruitment patterns were then obtained by application of the ELEFAN II program to these same length-frequency data.

The farming practices and economics of aquaculture in Thailand

The paper reviews freshwater and coastal aquaculture practices in Thailand, and compares the productivity, costs, and benefits across various types of cultivation and various intensities of production. The paper is based on data that were collected in surveys conducted during 1998-2001 by the Department of Fisheries (DOF), Thailand and the WorldFish Center. More than 22% of Thailand's fish supply comes from aquaculture, with coastal aquaculture accounting for more than 88% of this in terms of value.

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