FRESH- WATER FISHES OF SIAM, OR THAILAND 51 



The local fishermen call the fish pla kok or pla kodk^ sometimes, in 

 the Tale Sap, fla kwp. 



Genus ANODONTOSTOMA Bleeker 



Anodontostoma Bleekeb (16), Verb. Batav. Genootsch. (Madura), vol. 22, p. 15, 

 1849. (Type, Anodoniostoina hasseltii BleeViev—CI/upanodon chacunda 

 Hamilton. ) 



ANODONTOSTOMA CHACUNDA (Hamilton) 



Clupanodon chucutulu Hamilton, 1822, pp. 246, 383 (Gangetic estuaries). 

 Dorosoma chacunda Webeb and de Belvtjtort, 1913, vol. 2, p. 25, fig. 14 (Slam). 



Nearly all the observed occurrences of this species in Thailand apply 

 to the Gulf of Siam off the mouths of rivers. There are, however, a 

 few definite records for fresh water, such as the Chantabun River at 

 the town of Chantabun. Specimens from the Menam Chao Phya are 

 in the British Museum by gift of the old Siamese Museum long since 

 disbanded as a repository for natural-history specimens. Specimens, 

 15 to 16 cm. long, approaching the spawning condition and doubtless 

 destined for the lower reaches of the river have been taken off the 

 Menam Chao Phya in December. Young of the year, 6 to 6.75 cm. long, 

 have been caught at the head of the Gulf of Siam in July. 



Although very bony, the flesh is considered of good flavor, and in 

 the commercial fisheries of the Gulf of Siam large quantities are some- 

 times caught and are preserved by sun-drying with or without previous 

 pickling. 



The fishermen do not distinguish this species from Nematalosa nasus 

 (Bloch) and give it the same name, pla kok. 



Family ENGRAULIDAE: Anchovies 



Most of the Thai members of this large and important family are 

 marine. There are, however, species in four genera that regularly 

 enter fresh water and are entitled to a place in this catalog. They 

 may be differentiated as follows : 



la. Caudal fin small, pointed, not forked, and joined to the very long aual fin ; 

 tail strongly tapering ; upper rays of pectoral fins detached and filamen- 

 tous '. Coilia 



1&. Caudal fin large, forked, and entirely separate from the long anal fin; tail 



not strongly tapering; upper rays of pectoral fins not detached. 



2a. Uppermost ray of pectoral fins more or less produced into a filament but 



not detached from other rays ; origin of anal fin anterior or posterior to 



origin of dorsal fin ; spiniferous ventral scutes from head to anal 



opening Setipinna 



26. Uppermost ray of pectoral fins not produced into a filament. 



3a. Origin of anal fin anterior to origin of dorsal ; no free predorsal spine ; 

 spiniferous ventral scutes from base of pectorals to anal opening ; jaws 

 vpith canine teeth Lycothrissa 



