SEA-PERCH. 
45 
THE SEA-PERCH (sw. hafsaborren). 
ROCCUS LABRAX. 
Fig. 11. 
Spines on the 
rior margin. 
inferior margin of preoperculum pointing forwards, and fewer but larger than those on the poste- 
Scales on the head , at least those on the anterior part, of the forehead and on the cheeks , cycloid . 
The shaft of the vomer without teeth. 
R. hr. 7°; D. 9 ; A.—-, P. 2 + 15 + 1* *; V. C. x + 15 
14 11 5 
+ x e ; L. lat. 65 — 725 
Syn. Perea Labrax , Lin., Syst. Nat., ed. X, tom. I, p. 290; Schager- 
STRom, Vet.-Akad. Handl. 1829, p. 95, tab. Ill, figg. 5 — 7; 
Nilss., Prodr. Ichth. Sc., p. 81 ; Id., Skand. Fn. Fisk., p. 16. 
Centropomus lupus, Lacep., Hist. Nat. Poiss., IV, p. 267 ; 
Cuv., Val. {Labrax), Hist. Nat. Poiss., II, p. 56, tab. 11; 
Kr., Damn. Fislce, I, p. 23; Gthr, Brit. Mus. Cat., Fish., 
I, p. 63; Steind., Szber. Akad. Wiss. Wien, LVI, I (1867), 
p. 606; Coll., Norg. Fiske, p. 15; Cederstr6m, Ofvers. 
Vet.-Akad. Forh. 1876, n:r 4, p. 64; Lillj., Sv. Norg. Fn., 
Fisk., I, p- 55; Winth., Naturh. Tidskr. Kjobenh., 1879, p. 
6; Id., Zool. Dan., Fiske, p. 3, tab. I, fig. 2. 
Labrax Linnei, Malm, Gbgs , Boh. Fn., p. 379. 
In the colouring of its body the Sea-perch resem- 
bles the Salmon. The back is grayish black with a 
steel-blue lustre, the sides bright silver but this bright- 
ness tinged with a brassy yellow. The belly white. 
The unpaired and the pectoral tins, according to Malm,, 
of the same grayish black colour as the back. The 
ventral tins of the same colour as the belly. A black 
spot on the upper part of the gill-cover. Blanchere 6 '' 
describes the dorsal tins as rose-coloured, the pectoral 
and ventral fins as yellowish. The lateral line, according 
to Malm, is grayish white and coasted above and below 
by a very fine, blackish line. During youth, according 
“ In a specimen from Bohuslan there are only 6 branchiostegal rays. With respect to this abnormity we may point out that a spe- 
cimen of Roccus lineatus from the Potomac has 7 rays in the left branchiostegal membrane, but 8 in the right, while a specimen of R. 
americanus from Connecticut has 7 rays in the left branchiostegal membrane and 6 in the right. 
, 1 1 
* Sometimes — or 
12 1 + 12 
c Sometimes — or -. 
10 1 + 10 
Of the whole genus Roccus Day (Fish. G:t Brit., Irel., I, p. 8) remarks: “The number of anal spines 
has been observed to be inconstant.” 
d Or 2 + 14 + 1, or 2+14, or 2 + 15, or 2 + 16+1. 
e In the specimen of R. lineatus from the Potomac which is mentioned above, C. x + 15+x. 
f Excluding the small scales on the caudal fin which belong to the lateral line. 
9 Diet. Gen. d. Peclies p. 75. 
