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Water and sediment quality parameters in the Chalan Beel, the largest wetland of Bangladesh

Chinese Journal of Oceanology and Limnology 2015年第4期33卷 895-904页

作者： SAYEED Md.Abu HOSSAIN Mostafa Ali Reza WAHAB Md.Abdul HASAN Md.Tawheed SIMON kumar Das mazumder sabuj k.nti Faculty of Fisheries Sylhet Agricultural University Faculty of Fisheries Bangladesh Agricultural University School of Environmental and Natural Resource Sciences Faculty of Science and Technology Universiti Kebangsaan Malaysia Marine Ecosystem Research Center Faculty of Science and Technology Universiti Kebangsaan Malaysia

A study was conducted to investigate the status of the water and sediment quality in the Chalan Beel——a major fresh water fish reservoir of the country for a period of one year from July 2007 to June 2008. The mean values of water quality parameters(depth: 214.73±152.22 cm, temperature 27.68±4.26℃, transparency 123±82 cm, p H 9.7±0.47, total alkalinity 137±42 mg/L, conductivity 307±147 μs/cm, total dissolved solids 183±89 mg/L, ammonia-N 0.27±0.39 mg/L, nitrate-N 0.09±0.07 mg/L, phosphate-P 2.01±2.53 mg/L) and sediment quality parameters(p H 7.21±0.35, organic matter 2.59±0.52%, total nitrogen 0.09±0.04%, available phosphorus 5.4±3.6 Meq./100 g and exchangeable potassium 0.43±0.14 Meq./100 g) were within the range recommended for most of the inland fishes of Bangladesh. Although the water and sediment quality parameters except ammonia and phosphate are in the suitable range, the overall results suggest that better management techniques should be practiced in order to overcome the declining trend of associated aquatic life(fauna and flora) of this important fresh water body of Bangladesh.

关键词： Chalan Beel total dissolve solids transparency residual effect organic matter sustainable management

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Effects of temperature and diet on length-weight relationship and condition factor of the juvenile Malabar blood snapper(Lutjanus malabaricus Bloch & Schneider, 1801)

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2016年第8期17卷 580-590页

作者： sabuj k.nti mazumder Simon kumar DAS Yosni BAkAR Mazlan Abd.GHAFFAR School of Environmental and Natural Resource Sciences Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia Marine Ecosystem Research Center Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia School of Fisheries and Aquaculture Sciences Universiti Malaysia Terengganu

In this study we aimed to analyze the effects of water temperature and diet on the length-weight rela- tionship and condition of juvenile Malabar blood snapper Lutjanus malabaricus over a 30-d experimental period. The experiment was conducted in the laboratory using a flow-through-sea-water system. The fish were subjected to four different temperatures （22, 26, 30, and 34 ℃） and two diets （commercial pellet and natural shrimp）. Fish were fed twice daily. L. malabancus exhibited negative allometric growth （b〈3） at the beginning of the experiment （Day 0） at all temperatures and both diets except for 22 ℃ fed with shrimp, which showed isometric growth （b=3）. Conversely, at the end of the experiment （Day 30） fish showed isometric growth （b=3） at 30 ℃ fed with the pellet diet, indicating that the shape of the fish did not change with increasing weight and length, and a positive allometric growth （b〉3） at 30 ℃ fed with shrimp diet, which indicated that fish weight increases faster than their length. The rest of the temperatures represented negative allometric growth （b〈3） on both diet, meaning that fish became lighter with increasing size. The condition factors in the initial and final measurements were greater than 1, indicating the state of health of the fish, except for those fed on a pellet diet at 34 ℃. However, the best condition was obtained at 30 ℃ on both diets. Nev- ertheless, diets did not have a significant effect on growth and condition of juvenile L. malabaricus. The data obtained from this study suggested culturing L. malabaricus at 30 ℃ and feeding on the pellet or shrimp diet, which will optimize the overall production and condition of this commercially important fish species.

关键词： Length-weight relationship Condition factor Temperature Growth Aquaculture Snapper

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A multidisciplinary method to assess the reproductive biology of Mystus bleekeri

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Aquaculture and Fisheries 2023年第3期8卷 280-287页

作者： Tamanna Sultana sabuj k.nti mazumder Jannatul kubra Nurnobi Nishad Sarker Mohammad Ibrahim khalil Simon kumar Das Md.Arifur Rahman khan Md.Tawheed Hasan Department of Aquatic Resource Management Faculty of FisheriesSylhet Agricultural UniversitySylhet3100Bangladesh Department of Genetics and Fish Breeding Faculty of FisheriesBangabandhu Sheikh Mujibur Rahman Agricultural UniversityGazipur1706Bangladesh Department of Fish Health Management Faculty of FisheriesSylhet Agricultural UniversitySylhet3100Bangladesh School of Environmental and Natural Resource Sciences Faculty of Science and TechnologyUniversiti Kebangsaan MalaysiaUKM BangiSelangor43600Malaysia Department of Agronomy Faculty of AgricultureBangabandhu Sheikh Mujibur Rahman Agricultural UniveristyGazipur1706Bangladesh Department of Aquaculture Faculty of FisheriesSylhet Agricultural UniversitySylhet3100Bangladesh

The study aims to afford a deeper knowledge on reproductive biology of Mystus bleekeri from Surma River,Bangladesh in a multidisciplinary ***,the species is in demand as food and ornamental fish in Bangladesh but still now comprehensive details on reproductive biology of this species is *** 600 fish samples were derived from commercial catches from July 2018 to June *** differences in sex ratio,size distribution,condition factor(kn),fecundity,gonadosomatic index and gonadal maturation cycle were *** results showed 384(64%)female and 216(36%)male with an overall sex ratio of 1.77:1(female:male).Mean total length(TL)and body weight(BW)of all fish studied were 14.85±3.38 cm TL and 27.54±15.76 g,*** kn varied with length groups,the highest(1.45±0.23)and lowest(0.89±0.18)values obtained in 16.0-16.9 and 10.0-10.9 cm TL groups,*** highest kn was documented in October while the lowest was in *** GSI values showed two peaks in July and November for both the *** fecundity was found to vary from 1120 to 14790 eggs with average value of 4968±3047 with 14.4-18.3 cm in TL and 19.97-34.7g in *** relationship of fecundity with TL and BW was F=1.385TL13.405,r^(2)=0.885 and F=5.201BW^(4.827),r^(2)=*** behavior of spawning together with allochronic oocytes development has also been found through *** results of this study could be used for predicting the response of populations of fish in Surma River and/or other where to human interferences and environmental change.

关键词： Condition factor Gonadal cycle Gonadosomatic index Mystus bleekeri Sex ratio

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