DATA SOURCES AND STATISTICAL METHODS USED TO EVALUATE THE EASTERN HARBOUR FISHING ACTIVITIES IN ALEXANDRIA, EGYPT.

DATA SOURCES AND STATISTICAL METHODS USED TO

EVALUATE THE EASTERN HARBOUR FISHING ACTIVITIES

IN ALEXANDRIA, EGYPT.

By
GAMIL II. TIIOMAS
National Institute of Oceanography and Fisheries, Alexandria-EGYPT.
Key Words: Fishery Statistics, Egypt.
ABSTRACT
According to the recorded data which were collected by total enumeration
anddata C?fsampling method about boats landed at the Eastern-harbour, the
anl1ual fish catch ojabout 5000 ton was estimated in 1993 by the jormer in
comparison to about 7000 tons obtained by the later.
From both the gel1eral and special raisingfactor nearly the same catch of
about 660 tonsifnonth from this center is obtained, but depending 011 the
,\pecial factors more accurate figure is obtained Classification of boats
according to their fishing method. and from the mean catch (yJ) of each
categOly (method 2) monthly catch (if about 660 tons was estimated (c. V. 15
%), while from the mean monthly catch (R) ofall boats (method 3), the same
catch of660 tons is obtainedwith the highest degree ofprecision (c. V. ./%).
Using the proportional size ojboats (P) ill different groups (method 4), gives
the catch (if ./56 tOI1S with the lowest degree of precision (c. V. 20 %).
Sampling method ojdata collection, with the method ofspecial raisingfactor
or method 2, are recommended to be the acceptable for the Eastern-harbour
fish catch estimate