46 BULLETIN 188, UNITED STATES NATIONAL MUSEUM 



The female 58 cm. long referred to in the foregoing table had freely 

 running eggs. Over a pint of eggs were expressed, and a large part 

 of each ovary was still intact as shown by subsequent dissection. The 

 eggs as extruded were 0.66 mm. in diameter; after water-hardening 

 they were approximately 1 mm. Some of the eggs were artificially fer- 

 tilized. In view of the facility with which eggs may be taken and 

 hatched, the operation of a field hatchery at Pakret would be entirely 

 practicable as well as desirable. 



Another spawning ground of some importance may be the Tale 

 Sap, where Annandale reported the fish abundant in the outer lake 

 in February. 



Fishes may be taken in the Gulf of Siam during most of the year, 

 and it seems probable that fishes that come into being in the local 

 waters do not, in the course of growth, wander far from the great 

 shallow arm of the sea that laves most of the coast of Thailand. There 

 are records of fully adult fishes caught in bag nets off the Chantabun 

 Estuary in March, in traps at the head of the Gulf of Siam in July, 

 and in shore seines off Singora in October. As bearing on the age of 

 the fishes at spawning, a single observation may be offered. Scales from 

 a female 46 cm. long taken in the Menam Chao Phya in February were 

 examined by the late Dr. Nicholas Borodin, who had been making 

 studies of the scales of the American shad {Alosa sapidissima) for 

 age determination. He pronounced the scales to have come from a fish 

 5 years old, and noted that a 5-year-old American shad would have 

 an average length of 39 to 42 cm. 



The vernacular name for this fish is pla talum puk. A sandy spit 

 in the Gulf of Siam off Nakon Sritamarat bears the name Lem Pla 

 Talum Puk on the charts. 



Another species of this genus, H. kanagurta (Bleeker), which in- 

 habits the coastal waters of the East Indies, Ceylon, India, and 

 East Africa, is fairly common in the Gulf of Siam but does not 

 have the habit of ascending streams ; it is distinguishable from H. toll 

 by its small size (not exceeding 22 cm.), its more numerous gill rakers 

 (100 to 150 on lower arm of first arch as against 70 to 95 in toli)^ and 

 its shorter caudal fin (about equal to length of head, while in toll 

 this fin is 1.5 times the head). The fishermen give this species the 

 distinctive name of pla mong kroi or pla lin kroi. 



Genus SARDINELLA Cuvier and Valenciennes 



Sardinella Cuvieb and Valenciennes, Histoire natiirelle des poissons, vol. 20, p. 

 28, 1847. (Type, Sardinella aurita Cuvier and Valenciennes.) 



This world-wide genus of numerous sardinelike fishes has a number 

 of representatives hi the coastal waters of Thailand, and two of those 



