The Nutritious Pond System has now implemented its activities on the ground for a year. The project is a partnership between a research organization (WorldFish), universities (Wageningen University and Can Tho University), private sector firms (Nutreco, Skretting Vietnam, Vemedin) and shrimp farmers to develop a new approach to feeding pond aquaculture. This project Newsletter highlights recent activities and the first results of on-farm pond trials and outputs from fundamental research.
Shrimp farming is an important income generating activity for hundreds of thousands of small scale farmers operating extensive ghers in Bangladesh. White spot syndrome virus (WSSV) has caused major shrimp production losses globally including Bangladesh. This study investigated the benefits of stocking WSSV infection free (WSSVF) Penaeus monodon post larvae (PL) to extensive gher holders of southwest Bangladesh and considered different parameters of the farming system.
A study was undertaken to assess the growth performance of brackishwater tiger shrimp, Penaeus monodon under monoculture in a hardwater seasonal pond in Tamil Nadu, India. A production of 209 kg/ha/110 days was attained at a low stocking density of 1.5/m2.
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.
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.
This paper presents applications to several shrimp stocks of a new, computer-based set of methods for the detailed analysis of length-frequency data. These applications include the objective estimation of growth parameters, including seasonally oscillating growth, and of total mortality as. estimated from length-converted catch curves and from mean lengths. A method for obtaining estimates of natural mortality in shrimps is discussed.
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.
After the 2004 tsunami destroyed the aquaculture industry in Aceh, Indonesia, an area famous for shrimp, small-scale farmers struggled to rebuild their businesses. Now, as part of the IDH-funded Sustaining Shrimp Farming in Aceh project, WorldFish and partners are working with the Aceh Aquaculture Cooperative, formed in 2013, to establish a sustainable business model for the farming of black tiger shrimp, a premium product in foreign markets.
A quiet revolution is happening in the ponds of shrimp farmers in Bangladesh. Since 2012, commercial shrimp farmers have increased production by 21 percent to 280 kg per hectare, the result of following better management practices (BMP) and using virus-free shrimp seed. This is part of the USAID-funded Aquaculture and Income for Nutrition project, which has trained over 50,000 commercial farmers in BMP since 2012.
Following the the 2004 tsunami many in Aceh, Indonesia are rebuilding their lives with the help of aquaculture. WorldFish works with partners including Ecohub, the producer of this video, to champion small scale aquaculture providing social and economic protection for many affected communities.