MPhil Thesis

Comparative Studies on Fish Diversity in the Chalan Beel Before and After Establishment of Fish Sanctuary

2025-11-27T05:46:42Z

Comparative Studies on Fish Diversity in the Chalan Beel Before and After Establishment of Fish Sanctuary Shikha, Sadicunnahar A total of two years of investigation were done in Chalan beel, Tarash Upazila, Sirajganj district, where a fish sanctuary was constructed at the end of the first year, to determine the impact of the sanctuary on fisheries diversity. The monthly data is gathered through Seine net (Berjal). 43 species, including three alien species —Cyprinus carpio, the species Cyprinus carpio var specularies, and Oreochromis mossambicus—were identified from 11 orders and 18 families. The species with the greatest incidence was Puntius puntio (19.65%), which was followed by Amblypharyngodon mola (9.30%) and Colisa fasciata (9.57%). In 2020, Cypriniformes (46.67%) was the category with the most prevalent order. In 2021, the author, withers found 11 order, among these 11 orders, Cypriniformes found as dominant order (49.05%) and the rest 10 orders Cichliformes (1.25%), Siluriformes (20.80%), Clupieformes (4.17%), Anabatidiformes (19.49%), Decapoda (2.50%), Mastacembeliformes (0.17%), Synbranchiformes (0.002%), Perciformes (2.40%), Beloniformes (0.07%), Actinopterjii (0.007%), comprises respectively. The order Cypriniformes (17 species) was recorded to be the prevalent order, record keeping for 48.85% of the total order, upheld by Siluriformes (20.8%) and Anabantidaeformes (19.65%). Shannon-weiner diversity index is recorded 2.388 in 2020 before establishment of sanctuary and 2.528 is after establishment of sanctuary. On the setting up of the sanctuary, the mean value climbed to 2.53 from 2.39. The positive effects of the fish sanctuary could have improved the overall catch and biodiversity index, and they may also have been utilized to deal with the sustainable growth of fisheries diversity. This Thesis is Submitted to the Department of Fisheries, University of Rajshahi, Rajshahi for the Degree of Master of Philosophy (MPhil)

Reproductive biology and fishery of ailia coila (hamilton-buchanan) (siluriformes: schilbeidae)

2025-06-18T05:16:49Z

Reproductive biology and fishery of ailia coila (hamilton-buchanan) (siluriformes: schilbeidae) Alam, Md. Rabiul Fish and fisheries play a vital role in the economy of our nation. Bangladesh is endowed with unique aquatic resources for fisheries development. Though Bangladesh is a small country of only 147, 570 square kilometers, it contains an abundance of rivers, streams, canals, ponds, tanks and ditches. Bangladesh is the richest country in the world in terms of water resources. The Rajshahi Division in the Northwest Region (NWR) of the country covers an area of about 3.5 million hectares and accounts for about 25% of Bangladesh's land area. The population of this region is about one fourth of the total population of Bangladesh. The people of this area suffers more from malnutrition than those in other parts of the country. The per capita protein intake in Bangladesh is about 50 g/day of which only 7-8 g comes from animal protein (Haque, 1982). To raise the animal protein production for human consumption we need to increase the production of fish, poultry and cattle. In Bangladesh fish play a vital role in meeting the requirements for protein. One of the most complex problems facing the world today is the capacity of the environment to support human life. Bangladesh, as a nation, is faced not just with the problem of sufficient food production but also with the quality food production to improve the general health of the rapidly increasing population. Blessed with innumerable bodies of freshwater, the nation has the potentiality to become self sufficient in the production of protein food of superior quality- the fish. Bangladesh is rich in fish wealth, which is the second staple food of the people. It is not only a food product but also a cash product, as a good amount of foreign money is earned by exporting fish. Thus fish plays an important role in the economy and dietary habits of the people. Development of fisheries means the development of the country. Millions of landless people are engaged in fishing, fish processing, marketing, transportation, preservation, fish by products and other aspects of the fish industry. The people of our country are fond of fish and it is an established fact that fish has been the most preferred and major source of animal protein in the diet of the people of our country. Production of fish from inland waters in Bangladesh has declined. substantially. Consequently to the decline in fish production from inland waters and increase in population fish consumption per capita per day has droped from 33 g. The per day fish consumption per capita was 21 g in 1963- 1964, which decreased to 12 g in 1985. As a result animal protein is very low in daily diet of our rural people, which is among the lowest in the world. However, the large fishes are preferred more, though the catch deficit is being supplemented by the small fishes, which are more nutritious than the large fishes. The total protein intake in Bangladesh per capita per day is about 57 g of which 7.8 g are of animal origin as reported by nutrition survey 1963- 1964. Out of which 6.38 g i.e. about 80 percent come from fish alone (Rabbani and Hussain, 1970; Mannan, 1977; Ali, 1982). Fish diet mainly provides proteins, fats, vitamin A and D, and phosphorus. According to FAO-report 1991, fish contains 72% water, 19% protein, 8% fat, 0.5% calcium, 0.25% phosphorus and 0.1% vitamin A, D, B and C. The institute of Nutrition and Food Science (INFS) of Dhaka University has recommended that to arrest any further decline in the nutritional level of food of the people, an increase in the consumption of fish as 33.6 g/person/ day would be desirable. In this context, it would be well to examine how the recommended rate of the INFS will meet. A study made by the Bangladesh Bureau of Statistics (1985) indicates that inland fisheries contribute as much as 30.52 percent to the overall fish Production of the country. It has been shown that the proportion of the contribution of the capture (open water) and culture (closed water) fisheries to inland fisheries stand at 95 percent and 5 percent respectively. On the other hand, among the total capture fisheries 22.9 percent contribution was made by the small indigenous fish species (Nabi, 1987). Recently we are getting fish 36% from culture water and 64% from open water. In the 1930s and 1940s, capture fisheries contributed more than 90% of the total fishery resources while culture fisheries contributed 10% or less. Since then there has been a sharp decline in the capture fisheries and a gradual increase in culture based fisheries. The indiscriminate use of insecticides has drastically affected the fish population. With the increase in human population and their high demand for fish and other aquatic resources came the necessity for an increased production of fish. So we should concentrate our attention on better production of fish and fishery resources. The small indigenous fish species, thus make a very significant contribution to the fisheries of Bangladesh. In Bangladesh about 80 percent population is poor and they mainly depend on small size fish for their daily supply of animal protein (Siddique, 1985). Another advantage of small size fish is that they could easily breed and grow in a water bodies, where culture of the other major fishes are impossible. Bangladesh, being an agriculture country and rich in fishery, a number of potential water bodies remain neglected even up to these days. Only by proper culture of these fishery resources the country can overcome the problem of protein deficiency. In realizing this condition several research programs are being organized on different indigenous species by different research institutions of the country. The present thesis is a step in the direction of an effort to amass of information as much as possible on one of the hither to less known species Ailia coila (Hamilton-Buchanan). The freshwater A. coila a member of cat fish family is excellent as food and a rich source of protein in the common people. It is caught largely from the river Padma. A. coila carries its local name as Kajuli, Baspata (Rahman, 1989). This genus is represented by two species such as A. coila and A. punctata. This Thesis is Submitted to the Department of Zoology, University of Rajshahi, Rajshahi, Bangladesh for The Degree of Master of Philosophy (MPhil)

Effect of Hormonal Masculinization in Tilapia (oreocromis niloticusj with some aspects of Growth performance and production

2023-08-29T08:06:54Z

Effect of Hormonal Masculinization in Tilapia (oreocromis niloticusj with some aspects of Growth performance and production Hasanuzzaman The present study was conducted to evaluate the effects of 17 a-methyltestosterone hormone on the growth performance of Nile Tilapia ( Orechromis niloticus). The study was conducted in the Meridian hatchery, Sonagazi, Feni from February, 2019 to January, 2020. Brood fish was collected from NAMSAI farm Thailand and BFRI, Bangladesh. Eggs were collected from the fish mouth and then disinfected and finally placed to the hatching tray and jar. Hatched larvae were placed to the 12 SRT tank and applied different dose of 17 a-methyltestosterone hormone treatments. The experimental treatments were T0 (Control), T1 (50 mg/kg), T2 (60 mg/kg), T3 (80 mg/Kg) and each treatment had three replications. Study showed significant higher growth performance in T 2 treatment. The results showed that mean weight of fish was significantly higher under T2 (533.5±1.249 g), mean length was under T2 (29.97±0.153 cm) and SGR was under T2 (4.259±0.0013) in comparison with other three treatments. The highest survival rate 87 .6% was obtained in T 2• Highest value of FCR (1.8) was observed in T1 and lowest (1.2) was in both T2, T3, respectively. Highest sex reverse percentage was found in T2 (98%) followed by T3 (97.883%) and T1 (77.833%), respectively. There was a strong interaction between 17 a-methyltestosterone hormone and growth performance and sex reversal of Nile Tilapia (p < 0.05, n = 4). This study suggests that use of 17 a-methyltestosterone hormone can improve growth performance of Nile Tilapia. Keywords: Nile Tilapia (Oreochromis niloticus), Growth Performances, Sex Reverse, 17 a-methyltestosterone. This Thesis is Submitted to the Department of Fisheries , University of Rajshahi, Rajshahi, Bangladesh for The Degree of Master of Philosophy (MPhil)

Captive Breeding of Trichogaster lalius (Hamilton, 1822) and Trichogaster fasciata Bloch and Schneider, 1801

2022-05-09T14:40:58Z

Captive Breeding of Trichogaster lalius (Hamilton, 1822) and Trichogaster fasciata Bloch and Schneider, 1801 Galib, Shams Muhammad The study was conducted for a period of four years four years, from July 2011 to June 2015, with a view to producing offspring of two rapidly declining indigenous gourami species (Trichogaster lalius and T. fasciata) of Bangladesh in captivity. Other related issues like fecundity, larval development, breeding behavior and aquarium market potentialities were also studied. Larvae were produced under three treatments (T1=without hormone; T2=using hormone, PG; and T3=using hormone, ovulin) in both experimental aquaria and earthen ponds. Young fishes were collected from the wild sources and reared separately at the laboratory according to their sex until breeding trial. Male and female of T. fasciata reached 7.94±2.36 cm (10.10±1.45 g) and 8.23±2.31 cm (11.98±1.12 g) respectively, prior to breeding trial. Whereas, male and female of T. lalius were 5.94±1.99 cm (7.14±1.33 g) and 6.02±2.13 cm (7.84±1.56 g) respectively. Mean individual fecundity was found 1273±516.81 (T. fasciata) and 160.50±26.42 (T. lalius). In aquaria, the highest number of offspring of T. fasciata (345±49.93) was obtained in the T3 in 2014. Whereas, maximum number of T. lalius larvae (79.67±11.85) were obtained in the T3 in 2013. In earthen ponds, the highest number of offspring of T. fasciata (1532±249.31) was obtained in the T1 in 2014. Whereas, maximum number of T. lalius larvae (265±39.15) were obtained in the T1 in 2014. ANOVA analyses have revealed that all the results found in case of T1 and T3 were significantly different from T2 in both aquaria and earthen ponds (p<0.05). Half of the total newly born T. fasciata was observed in T3 on the 10th day after hatching followed by T1 (47% survival). In case of T. lalius, about one-third of the total larvae survived till the 10th day after hatching in T3 followed by T1 where about 60% larvae survived. Relationship of the breeding performance and water quality parameters were studied and described. Almost all the parameters were in suitable range for aquatic organisms in all the treatments and no statistically significant differences were recorded in maximum cases (P>0.05). Good demand of gouramies produced in captivity was recorded and the benefit-cost ratio was found very high. The breeding techniques in the present research could particularly be useful for both the conservation and expansion of ornamental trade of studied species. This thesis is Submitted to the Department of Fisheries, University of Rajshahi, Rajshahi, Bangladesh for the Degree of Master of Philosophy (MPhil)