Implications of Climate Change for Fisheries and Aquaculture in the Sundarbans Region of Bangladesh

Hasanuzzaman, Abul Farah Md.; Sayeed, Md. Ashkar Bin; Rahaman, S.M.B.; Huq, Khandaker Anisul

doi:10.53808/kus.si.sesb.2010.73-82-ls

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…While the fisheries to the Sundarbans are severely vulnerable to sea level rise and salinity intrusion (Hasanuzzaman et al, 2010), the potentiality of mud crab aquaculture is likely to be scaled up as the mud crab species have a wide range of salinity tolerance. Mud crabs can be farmed and fattened in pens/ cages in inundated coastal swamps, ghers, and tidal rivers whilst these pen and cage cultures are deemed as environment friendly aquaculture technology.…”

Section: Environmental Issuesmentioning

confidence: 99%

Mud Crab (Scylla spp.) Aquaculture in the South-West Sundarbans Region of Bangladesh

Hasanuzzaman

Arafat

Huq

2022

IJAQ

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Mud crab (Scylla spp.) aquaculture has become an important livelihood option for the coastal fisher-folks in Bangladesh. Mud crabs harvested from wild sources are traditionally fattened in pens installed in tidal rivers, ghers, and earthen ponds in Bangladesh. The study was aimed at understanding the practice and production economics of mud crab farming in the South-West Sundarbans region of Bangladesh, and was conducted in the areas namely Bagerhat, Satkhira and Khulna districts where mud crab fattening are predominately ventured. Most of the farmers fatten both male (lean) and female (gonadally immature) crabs of 100 - 180 g. The crabs are stocked at varying rate (12 - 641 g/m2), and fed at the rate of 8-10% of body weight with trash live fishes, dried fishes, snails, mollusks, and cattle viscera. The fattening for a mean cycle of 22 ± 14.34 days has the survival rate of 55 - 90%, and has the production of 0.065 ± 0.26, 0.084 ± 1.33, and 0.17 ± 3.76 kg/m2 in Bagerhat, Satkhira, and Khulna, respectively. After harvesting (mostly partial), crabs are sold at average price rate of 4.35 ± 0.45 US$/kg. The lowest production cost (3.14 US$/kg) and the better economic return (US$ 147.77) per cycle was recorded in the district of Satkhira. The mud crab fattening has hitherto been evaluated economically feasible in and around the Sundarbans region, but the production and economic efficiency can be scaled up adopting scientifically demonstrated regime of stocking, feeding, and health management. The development of crab seed hatchery, artificial feed for crab, and strongest marketing network are addressed as crux issues for the sustainability of mud crab aquaculture in Bangladesh.

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Section: Environmental Issuesmentioning

confidence: 99%

Mud Crab (Scylla spp.) Aquaculture in the South-West Sundarbans Region of Bangladesh

Hasanuzzaman

Arafat

Huq

2022

IJAQ

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Mangrove Is the Facto Nature-Based Solutions to Tackle the Climate Change Around the Globe

Ashrafuzzaman¹

2023

Handbook of Nature-Based Solutions to Mitigation and Adaptation to Climate Change

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Assessment of Embryonic and Larval Development of Nile Tilapia under the Traditional and Re-Circulatory Thermostatic System in Relation to Climatic and Water Quality Variations

Siddique

Mahalder

Haque

et al. 2023

Aquaculture Journal

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Embryonic and larval development of tilapia (Oreochromis niloticus) is very vulnerable to climate change in their early life stages. This study was conducted for an assessment of the embryonic and larval development of Nile tilapia in traditional hatchery and re-circulatory thermostatic systems. Daily changes in embryonic and larval development were measured through microscopic observation and image analysis in the laboratory. Climatic data and water quality parameters were measured every day using appropriate devices. Water temperature was varied with room temperature at the traditional hatchery system while it was maintained at 28.50 °C in the re-circulatory thermostatic system. A total of 200 unhatched eggs were stocked in every three trays of both systems. The egg diameters of the gastrula, segmentation, and pharyngula stages were measured at higher (2261.47 ± 81.66 µm, 2646.24 ± 17.98 µm, and 2710.90 ± 16.60 µm) in the re-circulatory thermostatic system than in the traditional hatchery system (2261.07 ± 81.52 µm, 2645.47 ± 18.24 µm, and 2710.01 ± 16.45 µm), respectively. For both systems, egg colors, egg size, black pigments, germinal ring, eye shape, tail, and heartbeat were determined through microscopic observation. Higher hatching and survival rates were found under the re-circulatory thermostatic system (95% and 97%) than under the traditional hatchery system (85% and 81%). About 6 h less hatching time was required under the re-circulatory thermostatic system than under the traditional system. At the end of 30 DAH (Days After Hatching), larval length and weight under the re-circulatory thermostatic system were found to be higher (15.736 ± 0.424 mm and 0.0528 ± 0.004 g) than under the traditional hatchery system (15.518 ± 0.415 mm and 0.050 ± 0.004 g), respectively. Larval growth patterns for both systems were found to have an exponential trend. PCA analysis revealed that two components were identified, one primarily associated with morphometric characteristics and the other with climatic and water quality parameters. These components showed that there were several interrelationships between the morphometric changes and the climatic and water quality parameters. The characteristic changes of larval development under the re-circulatory thermostatic system and the traditional hatchery system were found to be remarkably similar except for some deformities denoted under the traditional hatchery system. The changes of yolk sac, body pigmentation, dorsal and caudal fin shape, eye size, and head length and width were determined from 1 DAH to 30 DAH. After absorbing the yolk sac, ready-made feed was provided. The water temperature was varied from 30.50 °C to 35.50 °C in the traditional hatchery system. The highest air temperature and humidity were 33.87 °C and 69.94% while the lowest were 29.63 °C and 45.62%, respectively, in the traditional hatchery system. There has been no such comprehensive comparative study on hatchery production in Bangladesh, and therefore, further research might be carried out on broader aspects. This research would be highly beneficial for improving seed production at the tilapia fish hatchery level in the country.

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Implications of Climate Change for Fisheries and Aquaculture in the Sundarbans Region of Bangladesh

Cited by 3 publications

References 8 publications

Mud Crab (Scylla spp.) Aquaculture in the South-West Sundarbans Region of Bangladesh

Mud Crab (Scylla spp.) Aquaculture in the South-West Sundarbans Region of Bangladesh

Mangrove Is the Facto Nature-Based Solutions to Tackle the Climate Change Around the Globe

Assessment of Embryonic and Larval Development of Nile Tilapia under the Traditional and Re-Circulatory Thermostatic System in Relation to Climatic and Water Quality Variations

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