Growth parameters and mortality rates of Whipfin silver-biddy (Gerres filamentosus) and Longtail silver-biddy (Gerres longirostris) from creeks of Hara protected area in Jask, Iran

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Abstract

Population parameters of Whipfin silver-biddy (Gerres filamentosus) and Longtail silverbiddy
(Gerres longirostris) were studied from January to December 2006 in three creeks
(Markazi, Khalasi and Gabrik) of Hara protected area in Jask, Oman Sea. All fishes were
sampled by boat trawl and beach seine. Growth parameters were determined using the
monthly length–frequency parameters. The Mean total length was calculated at 6.2 and 5.4cm
for Whipfin silver-biddy and Longtail silver-biddy. The values of L∞ and K for Whipfin
silver-biddy were 16.8cm and 0.99 yr-1 and for Longtail silver-biddy, these were 15cm and
0.77 yr-1, respectively. The value of to was calculated at -0.12 year for both species. The
longevity was estimated to be 3 years for Whipfin silver-biddy and 3.8 years for Longtail
silver-biddy. The length-weight relationship were determined as W= 0.0088 L3.21 and W=
0.0087L 3.18 for Whipfin silver-biddy and Longtail silver-biddy, respectively. Results showed
the fish were in their juvenile stage which emphasized the supporting roles of creeks for
Gerridae as nursery ground.
* Corresponding author

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Iranian Scientific Fisheries Journal
Volume 20, Issue 4 - Serial Number 77
July and August 2011
Pages 139-150

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