TILAPIA 



on 



53 



83. TILAPIA LATEEISTRIGA. 

 Chromis lateristriga, part, Giintli. Proc. Zool. Soc. 1864, p. 312. 



Depth of body 21 to 3 times in total length, length of head 3 to 3^ 

 times. Head 2 to 2^ times as long as broad ; snout rounded, with 

 straight upper profile, as long as broad, as long as postocular part of 

 head ; e5e 3 (young) to 4 times in length of head, 1 to l\ times in 

 interorbital width, equal to prseorbital depth in adult ; snout moderate, 



Fig. 170. 



Tilapia laterislriga. 



L. Nyassa. 



f to I width of head, extending to between nostril and eye ; teeth rather 

 small, in 3 to 5 series, 40 to 70 in outer series of upper jaw ; 3 or 4 

 series of scales on the cheek, width of scaly part equal to or a little less 

 than diameter of eye. Gill-rakers rather short, 9 to 13 on lower part of 

 anterior arch. Dorsal XV-XVI. 10-12 ; spines increasing in length to 

 the last, which is g- to ^ length of head ; longest soft rays ^ to | length 

 of head in females, produced and as long as head in males. Anal 

 III 8-10; third spine ^ to f length of head. Pectoral as long as or a 

 little longer than head, reaching or nearly reaching origin of anal. 

 Ventral reaching vent or anal. Caudal scaled, densely in large specimens, 

 feebly but distinctly emarginate. Caudal peduncle 1^ to Ij times 

 as long as deep. Scales very finely denticulate, 32-33 y^ziz ' I'lteral 



