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Growth parameters and mortality rates of giant river-catfish <i>Sperata seenghala </i> from the Indus river, Pakistan

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Title Growth parameters and mortality rates of giant river-catfish Sperata seenghala from the Indus river, Pakistan
 
Creator Memon, Aamir Mahmood
Liu, Qun
Baloch, Wazir Ali
Mohsin, Muhammad
Karim, Ehsanul
Liao, Baochao
Jatoi, Saeedullah
Han, Yanan
Zhang, Qingqing
 
Subject Indus River
Sperata seenghala
Growth
Mortality
FiSAT
Pakistan
 
Description 1462-1469
Length frequency of Sperata seenghala1 from the Indus River were collected during the months of February, March, April, May and June in 2011. The sample consisted of n= 133 pairs of length and weight data. The length ranged from 46 to 113 cm TL (65.661±15.995 cm), while the weight varied from 500 to 7500 g TW (1806.391±1481.456 g). Length-weight relationship was calculated as a= 0.04, b= 3.047 (R2= 0.99). The von Bertalanffy growth function parameters for S. seenghala were L∞= 117.60 (TL cm) and K= 0.370 year-1, while the age at zero length was t0= -0.513 year. The total instantaneous mortality rate (Z) was estimated at 95% CI of 0.77-1.22 (Z= 1.00 year-1) in the Indus River. The natural mortality (M) was computed as M= 0.556 year-1 at an average annual temperature of surface water of 21oC, whereas the fishing mortality was estimated as F= 0.444 year-1. Therefore, exploitation ratio (E= F/Z) was calculated as E= 0.444. The growth performances indices for L∞ and W∞ were computed Φ'= 3.709 and Φ= 2.175 respectively. When tc was at 1, the yield per recruit analysis found that Fmax was at 0.85 year-1 and F0.1 at 0.75 year-1. The current age at first capture was about 1 year, the Fcurrent rate was 0.444 year-1. Thus the current fishing mortality rate was smaller than Fopt= 0.556 year-1, Fmax= 0.85 year-1 and F0.1= 0.75 year-1. Therefore, we can assume that the current stock of this important fishery resource is not over-fished.
 
Date 2017-06-14T04:58:48Z
2017-06-14T04:58:48Z
2017-07
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://nopr.niscair.res.in/handle/123456789/42229
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.46(07) [July 2017]