130 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



membrane is present in both series of finlets and 

 joins individual finlets at a point midway between 

 the insertion and the tip. The anal fin has 15 

 soft rays, the pectoral 27 rays, and the pelvic 6 

 rays. The tip of one large spme and outlines of 

 two additional spines are visible at the angle of 

 the preopercle. 



The two smallest specimens, of 20 mm. and 22 

 mm., agree in general with the description pre- 

 viously given for oceanic skipjack of this size by 

 Schaefer and Marr (1948), but differ in a few 

 respects from the larger juveniles. Body colora- 

 tion is lighter dorsaUy, and pigmentation is more 

 intense on the peritoneimi. The snout appears to 

 be more sharply pomted, possibly because the 



upper jaw noticeably overlaps the lower jaw. 

 Two conspicuous spines are present at the bend 

 of the preopercle^ and the tip of one additional 

 spine is visible on the inferior margm. Pigmen- 

 tation of the first dorsal fin is linuted to distal 

 ends of the fin membrane between the first and 

 seventh or eighth spine. This is also true of 

 larger specimens, but in the latter coloration ex- 

 tends to the base of the first few anterior spines 

 as well. The basal portion of the pectoral fin is 

 colorless, and the dorsal and anal finlets are 

 joined at the tips by interradial membranes. 



The capture of these small juveniles is definite 

 evidence that oceanic skipjack spawn in the 

 Phoenix Islands area. 



Published records oj juvenile oceanic skipjack (Katsuwonus pelamis Linnaeus) from the Pacific Ocean 



Date of capture 



August 1916. 

 July 1923--- 



Do 



August 1923- _ 

 Apr. 14, 1924. 



May 16, 1924- 

 May 19, 1924. 



Do 



May 21, 1924- 



Do 



Do 



May-June 1924. 



Do 



June 1924 



Do. 

 Do. 



Apr. 23, 1939. 

 May 3, 1940.. 

 Jan. 28, 1947- 



Mar. 29, 1947. 

 July 24, 1947. 



Do 



May 7, 1948- 



July 13, 1948. 

 Sept. 3, 1948- 



Locality 



Ryukyu Islands (Oki- 

 nawa) . 

 Ryukyu Islands 



do 



do 



Ryukvu Islands (29°47' 



N-i29°25' E.) 

 Ryukvu Islands (28° 10' 



"N-i29°15' E.) 

 Rvukvu Islands (29°51' 



N-i29°52' E.) 

 do 



Ryukvu Islands (29°47' 



N-i29°25' E.) 

 do 



.do. 



Ryukvu Islands (28°31' 

 N-i29°, 131° E.) 



do 



Ryukyu Islands 



.do- 

 .do- 



Truk Islands 



do 



Costa Rica (9°22.5' N.- 



85°47.5' W.) 

 Costa Rica (9° 10' N- 



85°20' W.) 

 Marshall Islands (Bikini 



Atoll). 

 do 



Philippine Islands 



(6°37.2' N-121°31' E.) 

 Hawaiian Islands (20°30' 



N- 158° 45' W.) 

 Hawaiian Islands (19°33' 



N-156°00' W.) 



How collected 



Pole and line (?) 



From skipjack or yellow- 

 fin tuna stomach. 



do 



do 



From skipjack stomach. 



From skipjack or yellow 



fin tuna stomach. 

 do 



do 



do 



do 



do 



Plankton net 



do 



From skipjack or yellow- 

 fin tuna stomach. 



do 



Dipnet 



Pole-and-line fishing 



From skipjack stomach. 

 Dipnet 



do 



Regurgitated by skip- 

 jack. 



do 



Dipnet 



Regurgitated by skip- 

 jack. 

 From skipjack stomach- 



Reference 



Kishinouye (1923, p. 388). 



Kishinouye (1924, pp. 88- 

 89). 



Do. 



Do. 

 Kishinouye (1926, p. 128). 



Kishinouye (1924, pp. 88- 

 89). 

 Do. 



Do. 



Do. 



Do. 

 . Do. 

 Kishinouye (1926, p. 128).' 



Do.i 

 Kishinouye (1924, pp. 88- 

 89). 



Do. 

 Kishinouye (1926, p. 128). 



Inanami (1942, p. 524). 



Do.' 

 Schaefer and Marr (1948, 

 p. 193). 



Do. 



Marr (1948, p. 202). 



Do. 

 Wade (1950, p. 399). 



Eckles (1949, p. 245). 



Do. 



' Identification reported as doubtful. 



