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vol-32SOME BIOLOGICAL STUDIES OF PARAPENAEUS
LONGIROSTRIS (LUCAS, 1846) (CRUSTACEA, DECAPODA)
IN THE MEDITERRANEAN COAST OF EGYPT
ABDEL RAZEK F.A.*
; EL-SHERIEF, S.S.**; TAHA S.M.* AND MUHAMAD, E.G.*
*
National Institute of Oceanography and Fisheries, Alexandria, Egypt
** Faculty of Science, zoology Dep. Alex. University
*E-mail: [email protected]
Keywords: Parapenaus longirostris, morphametric relationship, sexual maturity, spawning.
ABSTRACT
Parapenaeus longirostries (Lucas, 1846) is known by the deep marine water rose
shrimp and it constitutes with the shrimps Trachypenaeus curvirostries and Metapenaeus
stebbingi about 40-50% of total shrimp catch in Egypt. Bimonthly samples of P.
longirostris were collected from Abu-Kir Bay area near Alexandria city during the year
(2005), sex ratio showed monthly variations with the dominance of females in the catch.
The sizes of the females varied from 4.0 cm to 14.5 cm with high abundance of size group
9.0-9.5 cm and for males from 5.0 to 11.0 cm with dominance of length groups from 7.0 to
8.5 cm. computations of total length-carapace length and total length total weight and tail
weight relationships were done. The recovery rate for males is higher than females 64.8%
and 58.5% respectively. Size at first sexual maturity was found to be 5.6 cm total length
while the smallest observed ripe female was 7.0 cm., total length. Spawning takes place
throughout the year, with higher occurrence during November. Immature individuals were
found from January to September. Spawning is expected to be in deeper waters.
