Development of survivorship model for UV-B irradiated Catla catla larvae

2006 ◽  
Vol 42 (1) ◽  
pp. 17-23 ◽  
Author(s):  
Jai Gopal Sharma ◽  
Prabhat Mittal ◽  
Rina Chakrabarti
Keyword(s):  
Catla Catla ◽  
Survivorship Model

scholarly journals Quality changes in fish burger from Catla (Catla Catla) during refrigerated storage

2013 ◽  
Vol 52 (3) ◽  
pp. 1766-1771 ◽  
Author(s):  
M. Vanitha ◽  
K. Dhanapal ◽  
G. Vidya Sagar Reddy
Keyword(s):  
Catla Catla ◽  
Quality Changes ◽  
Refrigerated Storage ◽  
Fish Burger

Nutrients budget and effluents characteristics in polyculture of scampi (Macrobrachium rosenbergii) and Indian major carps ponds using organic inputs

2012 ◽  
Vol 66 (7) ◽  
pp. 1540-1548 ◽  
Author(s):  
Subhendu Adhikari ◽  
Bharat Chandra Sahu ◽  
Lambodar Dey
Keyword(s):  
Macrobrachium Rosenbergii ◽  
Nutrient Budget ◽  
Catla Catla ◽  
Average Weight ◽  
Cow Dung ◽  
Nutrient Loads ◽  
Feed Conversion ◽  
Indian Major Carps ◽  
Main Input ◽  
Major Carps

Experiments were conducted for the study of nutrient budget in farmers' ponds (0.4–0.6 ha) in Orissa, India, at stocking densities of 0.30–0.38/m2 for scampi (Macrobrachium rosenbergii) and 0.60–0.70/m2 for Indian major carps (Catla catla, Labeo rohita and Cirrhinus mrigala). The average initial body weights of scampi and the major carps were 0.02 and 8–10 g, respectively. The culture period was 272–292 days. Feed was the main input. The FCR (feed conversion ratio) varied from 1.78 to 1.83. Feed and cow dung were applied to these ponds as organic inputs. At harvest time, the average weight of scampi and carps varied from 73 to 92 g and from 718 to 820 g, respectively. Among all the inputs, feed alone accounted for 97.60% total nitrogen (N), 97.90% total phosphorus (P) and 94.72% total organic carbon (OC), respectively. The harvest of scampi and carps accounted for recovery of 52.45% N, 19.43% P and 18.12% OC, respectively. N, P and OC accumulated in sediment were 38.31, 71.40 and 69.50%, respectively. The median nutrient loads in the fish pond effluents were equivalent to 0.58 kg of inorganic N, 0.135 kg of P and 8.83 kg of total OC per ton of Indian major carps and scampi production.

scholarly journals Investigation on fish health and diseases in rural pond aquaculture in three districts of Bangladesh

2014 ◽  
Vol 11 (2) ◽  
pp. 377-384 ◽  
Author(s):  
MM Hasan ◽  
MAR Faruk ◽  
IZ Anka ◽  
MAK Azad
Keyword(s):  
Health Management ◽  
Group Discussion ◽  
Silver Carp ◽  
The Body ◽  
Catla Catla ◽  
Hypophthalmichthys Molitrix ◽  
Fish Health ◽  
Pond Aquaculture ◽  
Pangasianodon Hypophthalmus ◽  
Treatment Measures

The present study was conducted to know the culture strategies and fish health and disease problems in pond aquaculture in Mymensingh, Bogra and Pabna districts of Bangladesh. Questionnaire interview and participatory rural appraisal tools like focus group discussion (FGD) were conducted with selected fish farmers. In total 90 farmers were interviewed and 9 FGD sessions were conducted. Most of the respondents practiced carp and pangas polyculture and they had disease problems in their ponds. Prevalence of fish disease varied with cultured species and locations. The most prevalent diseases as reported by the farmers were pop eye (57.78%), ventral reddening (55.55%), tail and fin rot (48.89), hemorrhagic lesion over the body surface (45.56%), dropsy (40%), gill rot (40%), white spot (40%) and epizootic ulcerative syndrome or EUS (33.33%). According to farmers opinion most susceptible species to disease was silver carp, Hypophthalmichthys molitrix (57.78%); followed by mrigal, Cirrhinus cirrhosus (50%); catla, Catla catla (47.78%); sarputi, Barbodes gonionotus (47.78%); rui, Labio rohita (42.22%) and pangas, Pangasianodon hypophthalmus (42.22%). Higher mortality was found in pangas (53.56%). Clinically, pangas, koi and sarputi were found severely affected. Most of the farmers used some treatment measures against disease problems. This study also highlited some fish health management problems in pond aquaculture. Further studies should include identification and characterization of pathogens involved in different types of diseases in pond aquaculture. DOI: http://dx.doi.org/10.3329/jbau.v11i2.19944 J. Bangladesh Agril. Univ. 11(2): 377-384, 2013

Estimated mortalities of the immature stages of Aedes cantans (Mg.) (Diptera, Culicidae) in a natural habitat

1974 ◽  
Vol 64 (2) ◽  
pp. 265-276 ◽  
Author(s):  
K. H. Lakhani ◽  
M. W. Service
Keyword(s):  
Life Table ◽  
Adult Population ◽  
Natural Habitat ◽  
Age Distribution ◽  
Smooth Curve ◽  
Immature Stages ◽  
Life Table Parameters ◽  
Population Loss ◽  
Regular Sampling ◽  
Survivorship Model

AbstractFor three consecutive years the eggs, the immature stages and the emergent adults of Aedes cantans (Mg.) populations were sampled from a small woodland ditch in southern England with a view to constructing the life-table of the species. Estimates of the numbers of ‘viable’ eggs available for hatching and the size of the resultant adult population yielded an estimate of the probability of a ‘viable’ egg resulting in an adult. Estimating the mortality rates in different immature stages which occur simultaneously is known to be difficult. It was considered reasonable to rely on a generalised exponential survivorship model based on the assumption that the relative mortality rate during the duration of each instar of A. cantans is constant, but this rate may vary from instar to instar. The parameters of the model were estimated using experimental data on the duration and total incidences through regular sampling of different instars together with the estimate of the probability that a ‘viable’ egg would result in an adult. The survivorship picture thus obtained agreed closely with the survivorship pattern obtained using a graphical approach based on the construction of the stage-specific age distribution of the pre-adults, and then drawing a smooth curve through the age distribution to produce an approximation to the survivorship curve. Because mortality was similar in all three years, the three years' data were pooled to give estimates of the life-table parameters. These clearly showed that substantial population loss occurred in the first two larval instars of A. cantans.

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