Of the 101 shrimp-producing countries listed in the 1983 FAO Yearbook of Fishery Statistics, 70% are developing countries; the 4 leading producers from the Asia/Pacific region were India, China, Thailand, and Indonesia. Thedemand for shrimps in the world market and the shrimp supply situation are examined, considering also the need for aquaculture. Shrimp culture in India, Indonesia, Philippines, Ecuador, Brazil and Mexico is described briefly.
In view of the concern caused by the declining trend in the annual shrimp yield in the Central Gulf of California, an attempt was made to analyze the fishing effort level exerted upon the shrimp stocks of the blue (Farfantepenaeus stylirostris) and the brown shrimp (F. californiensis) from 1980 to 1991. For this purpose, both Schaefer and Fox production models were applied.
The effect of aquaculture, especially shrimp farming, on agriculture has caused heated debate among aquaculturists, agriculturists, and non-governmental organizations. As data on the negative impact of shrimp farming on adjacent rice fields are not available, a study was undertaken in rice fields skirting three shrimp farms: a semi-intensive farm; an extensive farm; and a semi-intensive farm with a buffer zone.
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.
This review focuses on yellow head complex viruses that threaten the prawn aquaculture industry and reports on the findings, current research methods, weaknesses of research and highlights knowledge gaps.
This paper introduces the characteristics of the Delta and outlines the pressures that are impinging on the sustainability of the Delta's wetlands. Although these pressures are non-linear and interacting, three are considered prominent. These pressures stem largely from rice production and the associated large scale water control infrastructures, shrimp aquaculture, and the inadequacy of the current institutional arrangements. Responses to these pressures are discussed noting the diverse interventions made in the past and the present.
In the Bay of Bengal of Bangladesh area the values of asymptotic length (La) for tiger shrimp (Penaeus monodon), green tiger shrimp (Penaeus semisulcatus) and brown shrimp (Metapenaeus monoceros) were found to be 30.0 cm, 23.5 cm and 16.5 cm for male and 32.1 cm, 27.0 cm, and 19.4 cm for female respectively while the growth co-efIicient(K) were 0.94, 0.80 and 1.5 year¯1 for male and 0.97,0.90 and 1.52 year¯1 tor female respectively.
Seven tank trials were undertaken involving the co-culture of sandfish and shrimp on sand. Sizes, stocking densities, feeding and other conditions were all varied. Results indicated that powdered sargassum did not support sandfish growth, although it may have prevented starvation, which otherwise killed juveniles within three to six weeks.
FiSAT (FAO ICLARM Stock Assessment Tools) programme was used to estimate population parameters of Lysmata ensirostris from length frequency data. The La (asymptotic length) and K (growth coefficient) were found to be 7.3 cm and 2.2/year respectively and the growth performance index (?) was found to be 2.069. An additional estimate of La Z/K was found to be 7.057 cm and 1.086 respectively. The annual rate of natural mortality (M), fishing mortality (F) and total mortality (Z) were found to be 8.44, 0.92 and 9.36 respectively. The selection pattern was found to be 5.642 cm.
The incidence of various human pathogenic bacteria in commercially available and home-made shrimp feeds used on some farms in India was analyzed. The Total Heterotrophic Bacteria in the commercial feed samples ranged between 103–105 cfu g-1 and those in the farm-made feeds between 106-107 cfu g-1. No bacteria of significance to human health were found to be associated with any of the commercial feed samples analyzed, while farm-made feeds analyzed during the study showed a high incidence of various human pathogens such as Vibrio parahaemolyticus, V.