International Journal of Marine Science, 2017, Vol.7, No.4, 31-36
33
Dorsal fin anomaly case
was observed in the species of
A. spinifer
. The description of the deformed specimen in
this species is given below.
Family: Sparidae
Argyrops spinifer
Shape of the dorsal fin of the normal specimen (TL 470 mm) (Figure 3):
The spinous part of the dorsal fin with two types of spines of different length. The anterior 4 spines are the longest.
The length of the spines reduced dramatically at the 5th spine and increased gradually toward the soft part of the
fin. The length of the rays in the soft ray part is nearly the same and the general shape of this part take the curved
contour of the fish body.
Figure 3
Argyrops spinifer
, TL 470 mm, showing normal dorsal fin
Shape of the dorsal fin of the abnormal specimens (TL, 460 mm) (Figure 4):
The spinous part and the anterior part of the dorsal fin look normal. The posterior 3-4 fin rays appeared severely
deformed and joined together. In the dorsal edge of the fish body, it appears like the underneat h supporting
pterygiophores have been lost and the contour of this area is lower than that under the normal part of the dorsal fin.
In addition to the dorsal fin anomaly observed, the lateral line below the deformed soft rays was shown to be
anomalous and 7-8 lateral line scales appeared raised upward. The remaining parts anterior and posterior to the
deformed area of lateral line were shown to be normal.
Figure 4
Argyrops spinifer
, TL 460 mm, showing abnormal dorsal fin
