FISHERY BULLETIN: VOL. 82, NO. 4 



reported that 2 or 3 dozens of this species were 

 often caught on an autumn day in pound nets on 

 the southern coast of Korea. It is caught in the 

 Mekong River of Cambodia and commanded a 

 high price in the Phnom Penh market in 1964 

 (D'Aubenton and Blanc 1965:242). 



Distribution. — Western Pacific from Japan and 

 China south to Cambodia and Vietnam where it 

 enters the Mekong River (Fig. 51). The northern 

 limit is Akita, Honshu, in the Sea of Japan and the 

 Chiba-Tokyo area on the Pacific coast (Kishinouye 

 1923:418). There are records or specimens from 

 Pusan, Korea (Mori 1928, 1952), Cheefo (= Yentai) 

 on the Shantung Peninsula (Reeves 1927), the 

 Zhoushan Islands (lat. 30° N, long. 122° E, USNM 

 220856), Foochow (ZMH 11384), Amoy (USNM 

 221277), and Hong Kong (CAS GVF HK 127). A 

 record from the Bonin (or Ogasawara) Islands 

 (Sugiura 1970; repeated by Zama and Fujita 1977) 

 has not been verified and seems very far offshore 

 for this species. It has been taken on the coast of 

 Vietnam at Nha Trang (Blanc et al. 1965). Scom- 

 beromorus sinensis is the only species of the genus 

 and of the family to move any significant distance 

 into freshwater. It was described as a distinct 

 species, Cybium cambodgiense , by Durand (1940) 

 from material from Phnom Penh, Cambodia, about 

 300 km up the Mekong River. Specimens (MNHN 

 1965-286-9) have come from Tonle Sap (or Grand 

 Lac) which is even further up the Mekong River 

 (Blanc et al. 1965). 



Geographic variation. — Morphometric data for 

 two small samples of S. sinensis were compared 

 with ANCOVA: China (n = 7-10) and the Mekong 

 River, Cambodia (n = 6). Null hypotheses that the 



2 sets of regression lines are coincident were 

 accepted for all but 1 set of the 26 sets, Sn-P 2 

 (intercepts 7.552 and 8.385 respectively). The 

 Chinese sample had slightly fewer gill rakers on 

 the first gill arch (11-14, mode 12, x 12.30) than the 

 Mekong sample (12-15, mode 13, x 13.17). No other 

 meristic differences were found. 



Material examined. — Total 19 (157-714 mm FL). 



meas.: 18 (157-714): China (10); Mekong R., 



Cambodia (6); Cochinchine (2). 

 counts: 18. 

 diss.: 1 (plus 1 head, 431 mm). 



Scomberomorus tritor (Cuvier) 



West African Spanish Mackerel 



Figure 69 



Cybium tritor Cuvier in Cuvier and Valenciennes 

 1831:176-177 (original description; Goree, Sen- 

 egal), pi. 218. Gunther 1860:372 (description 

 after Cuvier). Rochebrune 1882:96 (very com- 

 mon; Goree, Dakar). Osorio 1898:197 (Prin- 

 cipe). Pellegrin 1908:75 (Dakar). Chabanaud 

 and Monod 1927:278 (Port-Etienne), fig. 30 A. 

 Cadenat 1947:15 (common names; W. Africa). 

 Postel 1954:357-358 (stomach contents of 286 

 specimens), 362 (gonosomatic index). A. Postel 

 1955:60-61, fig. 3 (lower jaw teeth 10-21, upper 

 jaw teeth 13-27; 190 specimens), 63, fig. 5 

 (number of jaw teeth in males and females). 

 * Postel 1955a:4-158 (distribution, size, repro- 

 duction), pi. II, bottom figure. Postel 1955b: 

 31-32 (sex ratio, maximum size, number of 

 eggs). Frade and Postel 1955:35 (histology of 



FIGURE 69.— Scomberomorus tritor. Liberia, 430 mm FL, USNM 193178. 



668 



