The exotic barb Puntius gonionotus was introduced into Bangladesh in 1987. Its faster growth rate, nice taste and compatibility with our culturable species have made it very popular food fish in Bangladesh. With a view to providing some basic information towards development of sustainable seed production of the species, a study was undertaken to determine the fecundity and ovary characteristics of the fish. The mean fecundity of 55 gravid females (of 11 length group) of Puntius gonionotus was obtained as 14321 with a range of 2254.67 to 6964.73 from fishes having a mean total length and mean body weight of 200.13±20.58 mm and 196±34.379 g respectively. The relationship between the fecundity (F) and total length (TL), total body weight (TW), ovary length (OL) and ovary weight (OW) were established. Regression analysis was made and the co-efficient of correlation (r) was calculated for each of the following F-TL, F-TW, F-OL and F-OW and the values of r were obtained to be 0.84, 0.84, 0.95 and 0.96 respectively. In all the cases linear relationships obtained were highly significant.
Key words: Fecundity, Puntius gonionotus, ovarian characteristics.
J. bio-sci. 14: 99-102, 2006
A survey was conducted in Mohanpur Upazila, Rajshahi to determine the pond fishery resources and the livelihood status of fish farmers for a period of nine months (August 2005-April 2006). The survey was conducted on 90 fish farmers of 52 villages under 6 unions. Data were collected through personal visit and interviews following a detailed questionnaire. Pond sizes of the area varied from 15 to above 180 decimal of which maximum ponds (57.8%) were operated by single owner. Field observation revealed that 65.5% ponds were used for fish culture, whereas 28.5% and 6% ponds were culturable and derelict, respectively. Among the fish farmers 23.3% was illiterate whereas 14.4, 8.9 and 6.7% were educated upto primary, secondary and higher secondary or above level, respectively. Agriculture (51.1%) is the principal occupation of the pond owners followed by aquaculture (18.9%). The highest percentage (33%) fish farmers earned Tk. 25,000-50,000 per year, 32% earned Tk. 50,000-1,00,000 an the rest 25% earned above Tk. 1,25,000 annually. Fish farmers were found to face various problems such as social, economical and technical problems, which were identified during the study. Necessary overcome efforts are also suggested according to the problems.
Key words: Pond fishery resources, fish farmers, livelihood status
Univ. j. zool. Rajshahi Univ. Vol.25 2006 p.31-35
An experiment was conducted to study the induced spawning of Rajputi Puntius gonionotus (Bleeker) in the months of April, May, June and July 2005. Five different doses of PG were used in the experiment. In Puntius gonionotus all the different doses (doses D1-3.00 mg/kg, D2-6.00 mg/kg, D3-9.00 mg/kg, D4-12.00 mg/kg and D5-15.00 mg/kg) were affected equally (100%) in egg release. In the experiment both the males and females were given the 1st dose but the 2nd injection was given only to the females after 6 hours. The highest fertilization rates were 70.10±2.25% in April (dose D4), 75.00±2.10% in May (dose D3), 80.00±2.14% in June and 79.20±2.65% in July (dose D3). The highest hatching and survivability rates were 61.50±3.10 and 55.00±2.13 in April (dose D4), 68.00±3.5 and 63.00±2.20 in May (dose D3), 71.80±2.00 and 68.50±2.60 in June (dose D2), and 70.25±3.50 and 65.70±2.16 in July (dose D3) respectively. The month of June and the dose D2 (2mg in first injection and 4 mg in second injection) were found to be most effective for induced spawning of P. gonionotus.
Senescence is a cellular response towards various stresses, characterized by the permanent proliferative arrest on cells. 1 Pharmacological and/or genetic ablation of senescence/senescent cells improve health outcomes and extend the lifespan. 2 Autophagy is a lysosome-mediated cellular catabolic process, implicated with cellular senescence. In regulating the cellular homeostasis, autophagy usually suppresses cellular senescence by eliminating damaged cytoplasmic organelles and macromolecules. 3 In contrast, autophagy can also be activated by cellular senescence and up-regulated in senescent cells. 3 Under normal physiological conditions, cellular autophagy occurs at low baseline levels, which are up-regulated under various pathological conditions such as oxidative stress, starvation
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