Evangelio, J.

Germano, B.

Melgo, J.L.F.

Senona, C.

Open Marine Archive

  - 53 - 
GROWTH, MORTALITY, RECRUITMENT AND OTHER FISHERY PARAMETERS 
OF THE NAILON SHELL PAPHIA TEXTILE (GMELIN 1791) IN LEYTE  
Senona Cesar1, Bernardita Germano2, Jenny Lynn Melgo3 and Julissah Evangelio4 
1,2,4  Marine Laboratory-Institute of Tropical Ecology, Leyte State University 
    Baybay, Leyte, Philippines, 6521-A 
    E-mail: mubiana@yahoo.com 
      3 Ecological Marine Management, Vrije Universitiet Brussel 
    Pleinlaan 2, 1050, Brussel, Belgium 
 
Paphia textile (Gmelin 1791) locally known as ‘barinday’ is valued for its meat and shell 
with local and export markets. In the region alone, its meat is valued $60,465,600 – 
$398,640,000 annually. The fishery is a major source of livelihood around Biliran 
Strait, Philippines as well as in other regions in South East Asia. This study determines 
the growth, maturity, recruitment, spawning months, size at first capture and yield per 
recruit as well as to assess the effects of exploitation rates on the dynamics of the 
various populations, and to provide indicators for efficient sustainable exploitation. 
Fishery parameters were estimated from at least 300 specimens within one year fishery 
monitoring of P. textile fishers in Barangay Kawayan and Tinukdugan, Leyte, Leyte. The 
FISAT II (FAO-ICLARM Stock Assessment Tool version 1.1.0) software (Gayanilo et al., 
2002) was used to analyze the length frequency data. To facilitate better data analyses, 
the length frequency data were further separated into subsets based on modal length 
progression (Germano et al., submitted). Results of length-frequency analysis were 
further validated through scatterplots of daily effort against catch per unit effort CPUE 
(E/CPUE) fitted with a second-order polynomial. The apparent maximum sustainable 
effort (MSE) and maximum sustainable CPUE (MSCPUE) were determined from the 
resulting trendlines (Germano et al., submitted). The use of values from the subset 
analyses appeared robust as supported by the higher number of cohorts as seen from 
the daily catch; higher goodness fitted index (Rn) values; and results of gonadal 
analyses. Total mortality (Z), natural mortality (M), fishing mortality (F) and exploitation 
rate (E) were higher in Kawayan. Results showed recruitment overfishing for both sites 
and unsustainably high effort for Kawayan. Implications of the study and specific 
recommendations for the management of the fishery are discussed.  
References 
Gayanilo F.C. and D. Pauly. 1997. FAO-ICLARM stock assessment tools: Reference manual. 
FAO Comp. Info. Ser. No. 8. Rome, FAO. x+262p 
Germano B.P., M. Wolff and J.F. Melgo. (submitted). Growth, mortality and recruitment of the 
blue crab Portunus pelagicus (Linnaeus, 1766) in Leyte Gulf (Guiuan), Eastern Philippines. 
Asian Fisheries Science. 
 
 


Growth, mortality, recruitment and other fishery parameters of the Nailon shell <i>Paphia textile</i> (Gmelin 1791) in Leyte

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