This study was designed to determine the interrelationship between physico-chemical parameters and plankton community in three different aquaculture systems (wishpond, wishpond aquaponics and traditional fish pond). The water quality parameters, dissolve oxygen (DO), temperature, pH, ammonia, alkalinity and transparency were monitored and found within the recommended range. Different phytoplankton of four (4) different groups were observed where Chlorophyceae group was the most dominant (8.03±0.19) × 103 cells/l in wishpond system and Euglenophyceae was the less dominant (45.86±1.15) × 103 cells/l in traditional pond system. In addition, Zooplankton of Rotifera was found the most dominant (17.81±0.09) × 103 cells/l with following Cladocera and Copepoda. A significance difference were observed in case of plankton groups among three different aquaculture systems. The interrelationship among the physico-chemical parameters, temperature showed strongest relationship with all the other physico-chemical parameters where transparency showed no relation with dissolve oxygen. In case of phytoplankton groups, all four groups showed more or less positive relationship in all three different aquaculture system. The findings of this study will assist small-scale producers in choosing and properly operating a simple aquaponics system. Asian Australas. J. Biosci. Biotechnol. 2022, 7 (1), 13-22
The present study was undertaken with a view to finding out the carps poly-culture technique, pond management and cost analysis in Mohanpur, Rajshahi region of Bangladesh. The study was conducted for a period of four months (October 2010 to February 2011). It provides an overview on the guiding principles, aspects and tasks, and presents the applicable production techniques and patterns of carp polyculture. It is expected that this publication will help identify resources and contribute to the successful planning and realization of fish production by those fish pond owners and operators who need to strengthen and improve their knowledge on the subject. Asian Australas. J. Biosci. Biotechnol. 2017, 2 (1), 100-105
Growth performance of fishes was evaluated for a period of six months (May to October, 2007) in industrial waste fed ponds located at Rajshahi City under three different treatments of species variation namely Tl (Labeo rohita, Catla catla, Cirrhinus mrigala, Hypophthalmichthys molitrix, Cyprinus carpio) in non waste pond, T2 (L. rohita, C. catla, C. mrigala, H. molitrix, C. carpio, Labeo bata) in industrial waste fed pond and T3 (L. rohita, C. catla, C. mrigala, H. molitrix, C. carpio, L. bata, Oreochromis nilotica) in waste fed pond. All the treatments were replicated twice. Stocking density 14,000 individuals/ha was same for all the treatments. The average initial weight of fish was 28.9g. Treatments had no significant effect on the mean SGR and survival rate of fishes except C. carpio. Mean SGR (%, bwd-1), weight gain (g), final weight (g) and survival rate (%) varied from 1.14±0.26 (T2) to 1.67±0.44 (T1), 34.00±2.81 (T2), to 114.22±12.37 (T1), 235.75±2.59 (T3) to 752.50±4.50 (T1), 60.50±4.50 (T3) to 82.50±2.50% (T2), respectively. Total fish yield (Kg/ha) significantly (P<0.05) varied from 2234.50±24.40 (T2), to 2532.50±1.50 (T1). Mean water temperature [(27.73±0.50 (T1) to 28.09±0.53°C (T2)], dissolved oxygen [(4.45±0.18 (T3) to 6.00±0.22 mg/l (T2)], pH (7.73±0.11 (T1) to 8.32±0.15 (T3)], ammonia-nitrogen [(0.0069±0.0018 (T1) to 0.039±0.0029 mg/1 (T3)] and total alkalinity (95.09±3.22 (T1) to 160.49±18.97 mg/I (T2) significantly (P<0.05) varied under the different treatments. Asian Australas. J. Biosci. Biotechnol. 2016, 1 (3), 492-503
The study was designed to work on the determination of growth pattern of lesser spiny eel Macrognathus aculeatus (Bloch, 1786) evaluating length-length relationships. Lesser spiny eel is a small indigenous fish species collected monthly for a year from Dingaputa haor located at Mohanganj upazila of Netrokona district in Bangladesh. The standard length and total length of male ranged from 93 to 203 mm and from 101 to 214 mm, respectively. The standard length and total length of female ranged from 105 to 243 mm and from 108 to 256 mm respectively. The length-length relationship is described algebraically in the form of y = a + bx, and growth pattern was inferred to the direct proportionality between two lengths. The present study established the relationships between standard length and total length for male, female and combined fish separately. The constants of linear relationship of male in all months varied (slope, 1.01-1.07; intercept, -0.58-9.63). The generalized relationship of male was TL = 1.03 SL + 6.25. The constants of linear relationship of female in all months varied (slope, 0.99-1.05; intercept, 2.59-12.09). The generalized relationship of female was TL = 1.03 SL + 5.826. The constants of linear relationship of combined sex in all months varied (slope, 0.95-1.05; intercept, 2.41-18.78). The generalized relationship of combined sex was TL = 1.02 SL + 7.49. Correlation coefficents, r (≥ 0.913) and coefficients of determination, r2 (≥ 0.834) were high in all regression analyses in this study. Based upon r and r2, present study explained that standard length and total length were strongly associated, and standard length was very good predictor of total length. The growth pattern were isometric in September, November, December, February, March and April and allometric in October, January, May, June, July and August based on SL-TL relationship for male population. The growth pattern were isometric in October, March, April, July and August and allometric in November, December, January, February, May, June and September based on SL-TL for female population. The growth pattern were isometric in April, June and August and allometric in September, October, November, December, January, February, March, May and July based on SL-TL for combined population. This study would be beneficial for future research in order to make comparison between years and locations. Asian Australas. J. Biosci. Biotechnol. 2016, 1 (3), 471-482
This study focuses mainly on the traditional fish drying activities and role of women in fish drying sector in Chalanbeel area of northern part of Bangladesh. The study covers three different drying spots of Natore and Pabna districts. A total of 13 dried fish producer, 18 male worker and 27 female workers were selected for the study. The study was conducted over a period of six month from September to February 2014. In these study areas, sun drying of fish is generally carried out on bamboo made rack. Total 21 species were gradually used for drying selected from the local fish market and directly from the fishermen of Chalanbeel. The amount of salt used in fish drying ranges 2-4kg/40 kg fish. The dried fishes were bagged into a plastic and jute bags. The dried fish producers usually sell their products weekly from their storage. The lowest price of dried fish is 300-400 Tk./ kg for Punti and highest is 800 Tk./kg for Boal. The monthly production of the study areas ranges 1.8-4.00 mt. However, women play a significant role in dry fish processing. The paper points out that the sample women are involved in different income generating activities like drying, sorting and grading, cleaning and salting and monthly income derived from those activities vary in peak and lean season. The paper also identifies that the highest 51.85% women were found in 25-40 years age groups and the lowest 7.41% was found in 50-70 years age group and also 40.74% was found in 10-25 years age group which were (children) involved in drying activities instead of spending time in school. In the study areas 55.56% women were married, 40.74% were unmarried and 3.70% were widow. The highest percentage of family type (59.26%) was found as nuclear and the joint family was 40.74%. The educational status of women in drying point was 40.74% illiterate, 37.04% had education up to primary level 11.11% capable of sign only and 11.11% reach up to secondary level. Most of the respondents live in kacha house.59.26% of housing condition were kacha, 22.22% were semi-pucca and 18.52% were pucca. 33.33% people used own-tube well and 59.26% people used others-tube well for drinking water and household purposes while 7.41% used kua. From the study, it was found that 70.37% respondents had electricity connection and 29.63% had no electricity connection. In study areas, 59.26% respondents use defected semipucca, 29.63% respondents use kacha and 11.11% respondents use pucca sanitary latrine. In both study area, 100% of interviewed respondents were Muslim with no other religious person. Asian Australas. J. Biosci. Biotechnol. 2017, 2 (1), 89-99
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