Chemical and physical effects of crowding on growth and survival of Penaeus monodon Fabricius post-larvae

Nga, B.T.; Lürling, Miquel; Peeters, E.T.H.M.; Roijackers, R.M.M.; Scheffer, Marten; Nghia, Truong Trong

doi:10.1016/j.aquaculture.2005.02.026

Cited by 38 publications

(36 citation statements)

References 31 publications

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“…The HSP70 level in three tissues investigated in our experiment increased with increasing stocking density, which indicated it was stressful to shrimp under high stocking density. In the former study on black tiger shrimp by Nga et al (2005), the negative effects in stage 2 were caused mainly by water quality deterioration. In view of this, we excluded the effects of water quality by submerging all the cages in the same pond, and water quality was maintained at a level that could ensure the normal requirement of shrimp, so the results observed in our experiment necessarily meant crowding stress affected the HSP70 level of shrimp.…”

Section: Discussionmentioning

confidence: 94%

Untitled

Gao¹,

He²,

vector³

et al. 2017

Turk. J. Fish. Aquat. Sci.

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Section: Discussionmentioning

confidence: 94%

Untitled

Gao¹,

He²,

vector³

et al. 2017

Turk. J. Fish. Aquat. Sci.

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“…Both effects, reduced reproduction and increased mortality, are probably due to chemical stress by density dependent increasing ammonium concentrations. Nga et al [24] similarly investigated crowding effects on post-larvae of the black tiger shrimp Penaeus monodon and proposed ammonium toxicity as contributing factor in increased mortality and reduced growth. As recently shown by Chaparro et al, [25] not acutely toxic ammonium concentrations affected the parental generation of the South American slipper limpet Crepipatella dilatata and its progeny.…”

Section: Snail Density Significantly Affects Reproductionmentioning

confidence: 95%

Effects of test media on reproduction inPotamopyrgus antipodarumand of pre-exposure population densities on sensitivity to cadmium in a reproduction test

Sieratowicz

Schulte‐Oehlmann

Wigh

et al. 2013

Journal of Environmental Science and Health, Part A

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Molluscan species can be affected by various anthropogenic substances. Yet, these effects are disregarded in chemical risk assessment as molluscs are unrepresented in standard OECD guidelines. The project "validation of a mollusc reproduction test" (Federal Environment Agency, code 371165417) deals with the development of a test method with the mudsnail Potamopyrgus antipodarum for OECD purposes. In this context, the influence on reproduction of both, different media and varying snail density, has been observed in independent experiments. Further, the impact of density on the outcome of subsequent cadmium (Cd) toxicity in a test has been investigated to refine the existing methodology. First, adult snails were kept in different test media for 12 weeks. Second, snail density was increased for 4 weeks to induce stress. Snails from each density scenario were used for another 4 weeks in a reproduction test at an equal density with 12 μg Cd/L, respectively. Significant differences in reproduction between medium groups were noted after 4 and 8, but not 12, weeks. Further, reproduction was significantly altered by snail density in the beakers but after subsequent 4 weeks at a constant density, no differences were observed between control groups. Cd reduced reproduction and this effect increased with snail density in the pre-exposure period, demonstrating that a previous stress factor may result in increased sensitivity to chemicals and underlines the need for more standardized breeding conditions to minimize effect variations. Based on the outcome of this study, an acclimatization period of 12 weeks must be guaranteed for specimens transferred to another medium. Further, 4 weeks of acclimatization are necessary after density stress. An additional 12 weeks density experiment showed that medium volume in each replicate can be decreased by half to save on chemicals, water and space during tests.

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“…The simulation confirms for our study area what other researchers have discovered. Indeed, the benefits of a low stock density has been documented in a variety of previous studies, including the work by Nga et al [12], Soo [1], and Kautsky et al [13]. Although farmers may have been told about such studies, there are multiple reasons on why shrimp production in the Mekong Delta may turn out differently.…”

Section: A Brief Discussion Of Resultsmentioning

confidence: 98%

Learning from the Neighbors: Economic and Environmental Impacts from Intensive Shrimp Farming in the Mekong Delta of Vietnam

Nguyen

Ford

2010

Sustainability

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Abstract:Intensive shrimp farming is a lucrative and highly risky business. Before entering this industry, most farmers spend time observing the operation of pilot farms. This stage is important to master essential techniques and judge the profitability and risk associated with shrimp farming. Learning is a complex process that leads to misconceptions about the nature of short-term and long-term risks. This paper uses computer simulation to illuminate the dynamic nature of the learning processes, land conversion, shrimp production and environmental contamination. The model is based on conditions of the Dai Hoa Loc Commune in the Mekong Delta of Vietnam. Initial simulations match statistical data by revealing the high risk: high initial profits from the pilot farms followed by conversion from rice land to shrimp farms. When rapid conversion occurs, the region is vulnerable to excessive accumulation of nutrients, a decline in shrimp yields and financial failure. In contrast, low stock densities deliver a lower profit which is insufficient to stimulate mass land conversion. The paper concludes with testing recovery strategies for farmers who have suffered the longer term impacts of high stocking density. Results show that yield recovery is possible by improving the channel and imposing regulatory control over stocking density.

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Chemical and physical effects of crowding on growth and survival of Penaeus monodon Fabricius post-larvae

Cited by 38 publications

References 31 publications

Untitled

Untitled

Effects of test media on reproduction inPotamopyrgus antipodarumand of pre-exposure population densities on sensitivity to cadmium in a reproduction test

Learning from the Neighbors: Economic and Environmental Impacts from Intensive Shrimp Farming in the Mekong Delta of Vietnam

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