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13 results on '"Minhaz, Tashrif Mahmud"'

6. Chlorella vulgaris cultivation in photobioreactor using municipal wastewater for biofuel.

Author

Khatoon, Helena, Nayma, Zannatul, Amira, Kafia Islam, Usha, Sabiha Zaman, Hossain, Shahadat, and Minhaz, Tashrif Mahmud

Subjects
CHLORELLA vulgaris, PHOTOBIOREACTORS, SEWAGE purification, BIOMASS energy, LIPID analysis
Abstract

Microalgae, with their potential applications, particularly in food industry and Livestock feed as well as biofuel, has gained considerable attention in recent decades. As their culture using commercial media is expensive, an integrated approach using municipal wastewater is considered for simultaneous biomass production. Therefore, in this study, we evaluated the growth and biochemical composition of the green microalgae Chlorella vulgaris grown in municipal wastewater. Cultures in vertical column photobioreactor in outdoor/indoor conditions were also compared. C. vulgaris showed significantly higher (P <0.05) cell density, biomass, specific growth rate, lipid and carbohydrate in indoor culture condition than outdoor comparatively. Saturated fatty acids and polyunsaturated fatty acids containing 14-18 carbon molecules were significantly higher (P <0.05) in indoor culture. The result suggests that wastewater could be used as a low cost medium to grow C. vulgaris to obtain higher biomass and lipids. [ABSTRACT FROM AUTHOR]

Published
2023
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12. Characterization of Spatial and Temporal Variability of Crassostreaspp. Spat Settlement to Ascertain Allocable Sites for Spat Collection at Cox’s Bazar, Bangladesh

Author

Minhaz, Tashrif Mahmud, Sarker, Joyshri, Khan, Mohammed Nurul Absar, Khatoon, Helena, Alim, Md Abdul, Khalequzzaman, SM, Ahmad, Moin Uddin, and Rahman, Mohammad Redwanur

Abstract

Spat settlement (spat density, recruitment, and mortality) of edible oysters Crassostreaspp. was estimated for three sites (Nunia Chara [NC], Chowfoldandy [CD], and Sonadia Island [SI]) located along the Cox’s Bazar coast of Bangladesh from February 2019 to January 2020 by deploying shellstrings. Field observations were made every 15 d to understand the monthly variation of oyster spat settlement more precisely. Environmental variables varied significantly with the study site × month interaction or across study sites and months. Gonadal maturation and spawning of oysters may depend on certain environmental conditions, which were greatly influenced by seasonality, especially the monsoon. Spat density, recruitment, and mortality rates were significantly different with the study site × month interaction. The NC site offered higher spat density and recruitment than CD and SI during most months; spat density was lower due to increased mortality during the monsoon (late May to mid‐October) at all sites. Spat density was positively related to salinity, pH, and total suspended solids but negatively related to temperature and high‐ and low‐tide water depths. Recruitment was positively related to salinity and negatively related to low‐tide water depth. Spat mortality was positively related to high‐tide water depth but negatively related to low‐tide water depth. Eight different groups of fouling organisms were observed during the study, which could affect spat settlement. Most interestingly, oyster drills at NC and SI and marine macrophytes and bushlike organisms at CD and SI could contribute to increased mortality during the monsoon. This study showed that none of the three sites would be potential locations for spat collection on shellstrings during the monsoon; however, if avoiding the monsoon, NC has a higher potentiality of allocation for spat collection both for commercial farming and oyster restoration efforts.

Published
2021
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13. Growth Performance, Dietary Enzyme Profiling, and Antioxidant-Induced Immunity of Crassostrea belcheri Fed With Microalgal Diet.

Author

Acharjee MR, Hossain MS, Newase S, Das T, Haque ME, Nur S, Afrin S, Minhaz TM, and Khatoon H

Abstract

Diseases, overfishing, and habitat loss are constantly reducing oyster populations. Moreover, environmental pollution and natural disasters also hinder offshore shellfish cultivation. Therefore, filter-feeding bivalves could be cultivated on land-based system to maintain the culture condition and secure food safety. Four different diets including Chaetoceros gracilis (CG), Tetraselmis chuii (TC), mixture of CG and TC (CG/TC), and fresh seawater without feed (Con) were trialed for Crassostrea belcheri spat in this research. After 35 days of culture, the highest survival rate (SR), volume, and weight increment (WI) of oyster and improved water quality appeared in CG/TC. In the same manner, CG/TC diet exhibited greater lipase (LPS), pepsin (PES), catalase (CAT), alkaline phosphatase (AKP), and hydrogen peroxide (H 2 O 2 ) activity. Conversely, amylase (AMS), acid phosphatase (ACP), superoxide dimutase (SOD), malondialdehyde (MDA), and lysozymes (LZMs) activities were substantially higher in CG diet compared to TC, CG/TC, and Con. No significant differences were observed among CG, TC, and CG/TC for antioxidant capacity (AOC). In this investigation, mixed algal diet had excellent results for the growth and development of oyster, whereas unialgal diet improved immunity and AOC to survive in unfavorable conditions. This observation help elucidates the knowledge on microalgal diet influenced immune modulation and health of marine bivalves in the scenario of land-based farming., Competing Interests: The authors declare no conflicts of interest., (Copyright © 2025 Mahima Ranjan Acharjee et al. Aquaculture Nutrition published by John Wiley & Sons Ltd.)

Published
2025
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