KARYOLOGICAL ANALYSIS OF TWO SPECIES OF FAMILY SPAR/DAE: SPARUS AURATUS AND LITHOGNATHUS MORMYRUS

KARYOLOGICAL ANALYSIS OF TWO SPECIES OF FAMILY

SPAR/DAE: SPARUS AURATUS AND LITHOGNATHUS

MORMYRUS

BY
s. I. EL-DEEB*
*National Institute of Oceanography & Fisheries, Alexandria-Egypt.
Key words: Family Sparidae, Karyological Analysis.
ABSTRACT
Comparative karyological studies of Sparus auratus and
Lithognathus mormyrus (Family Sparidae) were carried out. The diploid
number of chromosomes , their morphological distribution, the arm
ratio, the total and relative length ofchromosomes, the total length of
chromosome set and the number ofarms were determined.
The diploid number of chromosomes was found to be 48for both
species.
In sparus auratus the chromosomes are more isobrachial than
Lithognathus mormyrus.
The morphological distribution ofthe karyotype ofthe two species is
different,’ Sparus auratus have two paris ofchromosomes consistently
involved’ satellite and three paris have chromatid bridgs, but
Lithognathis mormyrus have 6pairs consistently involved satellite and
one pair have chromatid bridge.