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vol-11SELECTIVITY OF TRAMMEL NETS
IN LAKE EDKU.
KH. A. HUSSEIN
Institute of Oceanography and Fisheries, Alexandria.
ABSTRACT
Family Mugilidae constitute a thriving industry in the
Egyptian lakes. Different ….g11 species are mainly caught
by the trammel nets. The analysis of experimental catch
of ….g11 saliens in lake Edku during 1972. using trammel
nets with slightly different mesh sizes (13.6, 15.4. 16.7
mm). showed that the optimal length lm of each used net
(A, B, C) was equal to: Alm = 15.8 cm, Blm = 17.9 cm and
Clm = 19.3 cm. Considering that Hugil saliens attains its
first maturation at a total length of 12.5 em, therefore
the experimental trammel nets were fairly legal for fishing
such species.
Optimal lengths determined from the selection curves.
as their modal lengths, were slightly lower than calculated
ones. The curves were slightly shifted to the left side
causing such decrease.
