Evaluation of space adequateness of shrimp farms in Southern Brazil

Freitas, Rodrigo Randow de; Hartmann, Carlos; Tagliani, Paulo Roberto Armanini; Poersch, Luís

doi:10.1590/s0001-37652011005000024

Cited by 3 publications

(4 citation statements)

References 12 publications

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“…Moreover, the Sentinel 2 satellite database cannot accurately predict these farms/ ponds because many of these farms in this study area have a lower area than its spatial resolution (i.e., 10 m × 10 m). Thus, the only way to extract such minute details and quantify the conversion process without spending any money is to use publicly accessible mufti-temporal Google Earth images (Freitas et al 2011 ; Dutta et al 2016 ). To examine this argument and establish the acceptability of the Google Earth images at the very first step comparison of predicting capability between land use land cover map based on Sentinel 2 satellite data (Fig.…”

Section: Resultsmentioning

confidence: 99%

From rice fields to brackish water farms: changing livelihoods in agrarian coastal Bengal, India

Goswami

Ghosal

2022

Asia-Pac J Reg Sci

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The present study attempted to understand the dimensions of changing agrarian livelihoods because of haphazard adaptation of capitalistic shrimp aquaculture. Specifically, using multi-temporal Google-based geodatabase, we quantified the artificial conversion of agrarian landscape in an inland freshwater region of coastal Bengal. Further, we examined the long-term viability of transformed livelihoods by adopting a modified version of the Sustainable Livelihood Approach (SLA). The assessment of changing livelihoods was based on empirical information acquired through field surveys, focus group discussion (FGD) and key informant interviews (KII). Results from the geostatistical analysis depicted that the shrimp culture in the research area was very recent. In 2010, only 0.03 percent of the total area was occupied by shrimp ponds. However, within a decade and an expansion rate of 18 percent/annum, the conversion spread to 1/3 of the total study area. The findings also clarified that the adaptation of shrimp cultivation increased the overall profit by 6400 USD/ha/year over agricultural output, and resulted in a quick rise in the standard of living for the shrimp farmers. However, in the long run, due to decreasing productivity and salinization of the surrounding land, the conversion resulted in massive depeasantization, augmentation of wasteland, and biased wealth accumulation led to a wide rich-poor gap. Therefore, the entire ecosystem will suffer in the near future, if the local government does not strictly impose Standard Operating Procedures (SOPs).

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Section: Resultsmentioning

confidence: 99%

From rice fields to brackish water farms: changing livelihoods in agrarian coastal Bengal, India

Goswami

Ghosal

2022

Asia-Pac J Reg Sci

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“…In addition, a better survival rate was associated with the lower density group ( Table 3 ). Similarly, Freitas et al [ 37 ] and Otoshi et al [ 20 ] reported that a significantly higher survival rate was obtained at 200 shrimp/m 2 density than 400 shrimps/m 2 density. Reduced survival rate at the higher densities might be due to negative behavioral interactions, for example, cannibalism [ 38 ].…”

Section: Resultsmentioning

confidence: 79%

“…TAN has a positive relationship to rearing density, i.e., the higher the density the higher recorded TAN as nitrogen released from shrimps and uneaten feeds leftover, consequently [ 22 ]. The higher levels of nitrite and ammonia in (300 org./m 2 ) stocking density compared to lower density may be related to the lower values of dissolved oxygen recorded in the high-density group [ 37 ].…”

Section: Resultsmentioning

confidence: 99%

Assessment of Performance, Microbial Community, Bacterial Food Quality, and Gene Expression of Whiteleg Shrimp (Litopenaeus vannamei) Reared under Different Density Biofloc Systems

Said

El-barbary

Ahmed

2022

Aquaculture Nutrition

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Biofloc shrimp culture, as a way of improving shrimp production, gains worldwide consideration. However, the effects of the biofloc system on shrimp culture at high densities could be a challenge. Here, this study is aimed at identifying a better stocking density of whiteleg shrimp (Litopenaeus vannamei) between two intensive biofloc systems of 100 and 300 org./m2. Achieving that was done by comparing growth performance, water quality, feed utilization, microbial loads from water and shrimps, and gene expression of growth, stress, and immune-related genes. Shrimp postlarvae with a mean weight of 35.4 ± 3.7 mg were reared in six indoor cement tanks (36 m3 total capacity each) at two stocking densities (3 replicates each) for a rearing period of 135 days. Better final weight, weight gain, average daily weight gain, specific growth rate, biomass increase percentage, and survival rate were associated with lower density (100/m2), whereas high-density showed significantly higher total biomass. Better feed utilization was found in the lower density treatment. Lower density treatment enhanced water quality parameters, including higher dissolved oxygen and lower nitrogenous wastes. Heterotrophic bacterial count in water samples was recorded as 5.28 ± 0.15 and 5.11 ± 0.28 log CFU/ml from the high- and low-density systems, respectively, with no significant difference. Beneficial bacteria such as Bacillus spp. were identified in water samples from both systems, still, the Vibrio-like count was developed in the higher density system. Regarding shrimp food bacterial quality, the total bacterial count in the shrimp was recorded as 5.09 ± 0.1 log CFU/g in the 300 org./m2 treatment compared to 4.75 ± 0.24 log CFU/g in the lower density. Escherichia coli was isolated from the shrimps in a lower density group while Aeromonas hydrophila and Citrobacter freundii were associated with shrimps from a higher density system. Immune-related genes including prophenoloxidase, superoxide dismutase (SOD), and lysozyme (LYZ) expressions were all significantly higher expressed in the shrimp from the lower density treatment. Toll receptor (LvToll), penaiedin4 (PEN4), and stress-related gene (HSP 70) showed a decreased gene expression in the shrimp raised in the lower density. Significant upregulation of growth-related gene (Ras-related protein-RAP) expression was associated with the lower stocking density system. In conclusion, the current study found that applying high stocking density (300 org./m2) contributes negatively to performance, water quality, microbial community, bacterial food quality, and gene expression of immune, stress, and growth-related genes when compared with the lower stocking density system (100 org./m2) under biofloc system.

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“…The use of satellite images has permitted monitoring and mapping of areas that require attention concerning the natural resource management [52][53][54]. Aerial survey techniques provide a level of details that allow the visualization of the landscape according to its structure and spatial-temporal distribution.…”

Section: Assessment Of Land Cover and Land Usementioning

confidence: 99%

Brackish Shrimp Farming in Northeastern Brazil: The Environmental and Socio-Economic Impacts and Sustainability

Sá¹,

Sousa²,

Rocha³

et al. 2013

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Despite the economic importance of farmed shrimp, a number of technical, environmental, economic and social problems have been widely reported in the international literature. This paper focuses on the environmental and socio-economic impacts of semi-intensive and intensive shrimp farming in the coastal region of Northeastern Brazil and the identification of options for sustainable production. In this Region, the total area dedicated to shrimp farming is approximately 18,500 ha, of which 5750 ha are located in Ceará State. The estuary of Jaguaribe river has the largest number of shrimp farms in the state of Ceará. Currently, the industry has 64 participating farms with a total area dedicated to shrimp farming of 2411.3 ha. In 2011, the total production was 13,110 tons of shrimp with an average yield of 6.3 ton ha −1 ·year −1 in a pond area of 2071.2 ha. This industry employs 2350 people that represent 23.2% of jobs generated in the two municipalities where the Jaguaribe river estuary is inserted. Compared with other countries, Brazil has reduced its exports due to high cost inputs for shrimp farming. However, the Brazilian shrimp industry has benefited from high domestic prices, despite the decreases in international price of shrimp. In 2011, the prices for size category ranged between U$ 4.67 -6.04 for 80/100 (count of head-on shrimp), U$ 4.95 -6.60 for 70/80 and U$ 5.85 -8.10 for 50/60. The major environmental impacts in this industry have focused on the water pollution and loss of mangroves. However, no change in parameters of water quality was observed during the period 2010-2012, indicating that this estuary has some capacity to process pond-derived nutrients while only 3.7 ha of mangrove forests were used to shrimp pond. The results of this investigation demonstrate that Brazilian shrimp industry requires improved management and development policy for a sustainable growth.

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Evaluation of space adequateness of shrimp farms in Southern Brazil

Cited by 3 publications

References 12 publications

From rice fields to brackish water farms: changing livelihoods in agrarian coastal Bengal, India

From rice fields to brackish water farms: changing livelihoods in agrarian coastal Bengal, India

Assessment of Performance, Microbial Community, Bacterial Food Quality, and Gene Expression of Whiteleg Shrimp (Litopenaeus vannamei) Reared under Different Density Biofloc Systems

Brackish Shrimp Farming in Northeastern Brazil: The Environmental and Socio-Economic Impacts and Sustainability

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