Comparative study on Liza ramada (Risso, 1827) fishery status and management between Suez Canal Lakes, Egypt

Document Type : Original Article

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Abstract

The population parameters of the thin lipped grey mullet Liza ramada in
the Suez Canal lakes; Bitter and Timsah Lakes were investigated based on
samples collected from landing sites of the Timsah and Bitter lakes during
the period from December 2016 to November 2017. Based on the reading of
scale‟s growth rings, the life span for L. ramada was 6 years at Bitter lakes
and 7 years at Timsah Lake. The growth parameters (L∞ and K) of von
Bertalanffy growth equation for combined sexes of L. ramada in Bitter
Lakes were L∞ = 49.48 cm and K= 0.48/yr. while L. ramada population in
Timsah Lake have L∞ = 52.2 cm and K= 0.46/yr. Mortality parameters (Z,
M, F) were 2.54, 0.57 and 1.96 year-1 respectively at Bitter Lakes and the
same parameters were 2.05, 0.53 and 1.52 year-1 respectively at Lake
Timsah. The estimated exploitation ratios were 0.77 and 0.74 year-1 for L.
ramada population at Bitter and Timsah Lakes respectively. Relative yield
per recruit (Y/R)' model was used for evaluating L. ramada fishery status
and the results obtained revealed that stock of L. ramada in both
investigated areas; Bitter and Timsah Lakes were being overexploited and a
suitable management measures should be applied for protecting these
valuable fishery resources.

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