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Benchmarking pre-spawning fitness, climate preferendum of some catfishes from river Ganga and its proposed utility in climate research

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Title Benchmarking pre-spawning fitness, climate preferendum of some catfishes from river Ganga and its proposed utility in climate research
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Creator Uttam Kumar Sarkar, Malay Naskar, Koushik Roy, Deepa Sudeeshan, Pankaj Srivastava, Sandipan Gupta, Arun Kumar Bose, Vinod Kumar Verma, Soma Das Sarkar, Gunjan Karnatak, Saurav Kumar Nandy
 
Subject Mystus tengara . Mystus cavasius . Eutropiichthysvacha .Fulton’sconditionfactor .Kaplan- Meier survival fit . LOESS fit . Climate change
 
Description Not Available
The concept of threshold condition factor (Fulton), beyond which more than 50% of the female
fish population may attain readiness for spawning coined as pre-spawning fitness (Kspawn50), has been
proposed in the present article and has been estimated by applying the non-parametric Kaplan-Meier method
for fitting survival function. A binary coding strategy of gonadal maturity stages was used to classify whether a
female fish is Bready to spawn^ or not. The proposed Kspawn50 has been generated for female Mystus tengara (1.13–1.21 units), M. cavasius (0.846–0.945 units), and Eutropiichthys vacha (0.716–0.799 units). Information on the range of egg parameters (fecundity, egg weight, egg diameter) expected at the pre-spawning stage was also generated. Additional information on speciesspecific thermal and precipitation window (climate preferendum) within which Kspawn50 is attained was also generated through the LOESS smoothing technique. Water temperatures between 31 and 36 °C (M. tengara), 30 and 32 °C (M. cavasius), and 29.5 and 31 °C (E. vacha) and monthly rainfall between 200 and 325 mm (M. tengara), > 250 mm (M. cavasius), and around 50mm and between 350 and 850 mm(E. vacha) were found to be optimum for attainment of Kspawn50. The importance of parameterization and benchmarking of Kspawn50 in addition to other conventional reproductive biology parameters has been discussed in the present article. The purposes of the present study were fulfilled by generating baseline information and similar information may be generated for other species replicating the innovative methodology used in this study.
ICAR and NICRA
 
Date 2018-10-27T13:50:19Z
2018-10-27T13:50:19Z
2017-08-21
 
Type Research Paper
 
Identifier 2
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http://krishi.icar.gov.in/jspui/handle/123456789/8377
 
Language English
 
Relation Not Available;
 
Publisher Cross Mark