Growth, mortality and stock assessment of kelee shad, Hilsa kelee (Fam: Clupeidae) in the coastal waters of Pakistan

Panhwar, Sher Khan; Liu, Q.; Siddiqui, Ghazala

doi:10.1134/s0032945213030168

Cited by 11 publications

(7 citation statements)

References 6 publications

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“…In this study the growth coefficient k was 1.5 year −1 , higher than the reported growth coefficient of 0.77 in Iranian waters (Roomiani and Jamili, ), and 0.82 in Bangladesh waters (Nurul Amin et al., ). Panhwar et al () reported growth in kelee shad (Hilsa kelee) as k = 0.94; they also observed higher natural mortalities that might have been caused by the high salinities or low freshwater drainage to the sea, which damaged the reproductive potential of the estuarine or coastal fishes. From Maputo Bay, Mozambique, Sousa and Gjosaeter () reported asymptotic length = 21.5 cm, growth k = 1.10 year −1 and t 0 = −0.44 year in kelee shad, with high fishing pressure.…”

Section: Discussionmentioning

confidence: 99%

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Population statistics of the migratory hilsa shad,Tenualosa ilisha,in Sindh, Pakistan

Panhwar

Liu

2012

J. Appl. Ichthyol.

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Summary In order to estimate the population dynamics of the hilsa shad, Tenualosa ilisha, fishery in Sindh, the key population parameters of growth, mortalities, recruitment pattern, exploitation and maximum sustainable yield are discussed. Length frequency data were collected from April to October 2004 from the main commercial (hilsa) landings at Thatta, Sindh. Estimated parameters of the von Bertalanffy (Hum. Biol. 10, 181–213) growth model were L∞ = 31.5 cm, K = 1.5 year−1, t0 = −0.10 year as obtained by the electronic length frequency analysis (ELEFAN I). Estimated natural, fishing, and total mortalities were 2.21, 0.673, 2.89 year−1, respectively. The relative biomass per recruit (B′/R) was 0.95 and yield per recruit (Y′/R) was 0.06 using the knife‐edge selection. The exploitation ratio at the maximum sustainable yield (MSY) was Emax = 1.0 year−1, fishing mortality at MSY was Fmax = 2.89 year−1, average target Fopt = 0.5 year−1 and Flimit = 1.47 year−1. The catch and effort data from 1981 to 2004 (MFD, Karachi) were analyzed using the catch and effort data analysis (CEDA) computer programme. Estimated biological reference point of MSY for the Fox model was 891 tonnes (t), R2 = 0.75; for the Schaefer and Pella‐Tomlinson models MSY = 744 t, R2 = 0.49, the outputs of which appeared to be more conservative than the Fox model which indicated a better fit. The overall situation of hilsa fishery is in severe stress and appears vulnerable to overexploitation. On the basis of the present findings, serious attention is required to provide appropriate access of the fish to the Indus River during the spawning period as well as to impose a ban on fishing during upstream migration and on undersized catch to prevent this traditional fishery in this area.

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Section: Discussionmentioning

confidence: 99%

“…From Iranian waters, Roomiani and Jamili () also reported T. ilisha to be under high fishing pressure. In Pakistani waters (Panhwar et al., ) studied high natural mortalities in Hilsa kelee whereby the fishing mortality indicated that kelee shad stocks appeared to be near‐overfished.…”

Section: Discussionmentioning

confidence: 99%

Population statistics of the migratory hilsa shad,Tenualosa ilisha,in Sindh, Pakistan

Panhwar

Liu

2012

J. Appl. Ichthyol.

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“…Fish and their products are the most significant protein source for global population ( Roy et al., 2020 ). The increasing demand for products creates massive fishing pressure on natural stock, especially in the open-water ecosystem ( Panhwar et al., 2013 ). Fish are now considered as limited renewable resources ( Gulland, 1982 ).…”

Section: Introductionmentioning

confidence: 99%

Stock assessment of Hooghly Croaker Panna heterolepis in the Bay of Bengal (Southern Bangladesh): implications for sustainable management

Sabbir

Rahman

Hossain

et al. 2021

Heliyon

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The study describes growth pattern, growth parameter, mortality, recruitment pattern, exploitation rate ( E) and maximum sustainable yield (MSY) to Panna heterolepis from the Bay of Bengal (Bangladesh). About 1223 specimens were collected from commercial fishermen for 12 consecutive months from January to December, 2019. Length–frequency data were analyzed with FAO-ICLARM Stock Assessment Tool. Moreover, our study recorded different water quality and environmental parameters including pH, rainfall, temperature and DO (dissolved oxygen) from the Bay of Bengal. The findings of the study revealed that the allometric co-efficient ( b ) value indicated negative allometric growth (<3.00) for P. heterolepis population. Whereas, the population dynamic parameters showed growth coefficient ( K ) 0.13 year −1 , life-span ( t max ) 3.85 year and growth performance index ( Ø′ ) 2.30. Along with this, P. heterolepis was found to grow rapidly with an asymptotic length ( L ∞ ) of 39.08 cm. We found that the natural mortality ( M = 0.44 year −1 ) rate was almost similar with fishing mortality ( F = 0.42 year −1 ). Consequently, the standing stock was not quite sustainable with the existing fishing strategy. Furthermore, the maximum allowable exploitation rate ( E max = 0.471) was lower than the recorded exploitation rate ( E = 0.490). Subsequently, overfishing is the most focal threat to the wild stock. The recruitment pattern was almost continuous throughout sampling period. Finally, the MSY was assessed at 10234.47 metric tons. Additionally, the environmental parameters denoted that the ecosystem was in a balanced condition for the wild population. The findings would be very useful to introduce appropriate fishing regulations in the Bay of Bengal and nearby ecosystem.

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“…Thus, in most species of the family the natural mortalities are high, especially in the young stages (e.g. PANHWAR et al, 2013). The total absence of capture at this stage may result in loss of biomass available for high levels of natural mortality.…”

Section: /12mentioning

confidence: 99%

Untitled

2018

Bol. Inst. Pesca

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The selectivity of gillnets for the inhabiting forage fish community in the Santa Cruz Channel (PE, Brazil) was estimated an experiment using three mesh sizes (30, 40 and 50 mm). The SELECT was used to estimate retention curves through four models: normal location, normal scale, lognormal and gamma. Aggregated as catches in all fisheries, 28 species were identified. Selectivity parameters for species Opisthonema oglinum, Anchovia clupeoides and Cetengraulis edentulous were estimated. The normal scale model gave the best fit for all species studied. In the case of O. oglinum fishing in the Santa Cruz Channel the catches of young individuals are particularly significant in gillnets with a 30 mm mesh size. However, a possible increase in mesh size indicates little change in the length structure of the catch for larger sizes, but catches would certainly be reduced. Thus, regulations with increased mesh size should result in non-viability of fishing continuity with reduced catches.

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Growth, mortality and stock assessment of kelee shad, Hilsa kelee (Fam: Clupeidae) in the coastal waters of Pakistan

Cited by 11 publications

References 6 publications

Population statistics of the migratory hilsa shad,Tenualosa ilisha,in Sindh, Pakistan

Population statistics of the migratory hilsa shad,Tenualosa ilisha,in Sindh, Pakistan

Stock assessment of Hooghly Croaker Panna heterolepis in the Bay of Bengal (Southern Bangladesh): implications for sustainable management

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