RUDDER FISHES IN THE WESTERN NORTH ATLANTIC 



477 



Table 13. — Afeasuretnents of selected body parts of ltd 

 specimens of Kyphosus sectatrix and 99 specimens of 

 Kyphosus incisor, expressed as percentage of standard 

 length — Continued 



KYPHOSUS INCISOR-Continued 



KEY TO THE NORTH ATLANTIC 

 KYPHOSUS 



SPECIES OF 



standard 

 length (mm.) 



24.8 



26.4 



25.4 



25.5 



25.8 



26.3 



27.4 



27.5 



27.7 



28.0 



28.4 



28.6 



28.6 



29.6 



29.7 



29.8 



30.8 



31.0 



32.5 



33.6 



34.5 



35.1 



35.2 



37.0 



37.5 



37.5 



38.0 



38.2 



38.3 



38.7 



38.8 



39.1 



41.5 



44.2_ 



44.5 



44.5 



45.2 



45.2 



45.5 



50.0 



54.5' 



58.5 



101.6 



184.5 



192.0 



233.0 2- 



239.0 



282.0 i 



Percent of standard length 



Eye 

 diam- 

 eter 



14.1 

 12.6 

 11.4 

 12.9 

 13.2 

 13.3 

 11.5 

 12.7 

 13.0 

 12.9 

 11.2 

 14.0 

 11.9 

 11.8 

 12.4 

 12.4 

 11.7 

 11.9 

 12.9 

 11.9 

 12.6 

 12.8 

 13.1 

 11.9 

 11.6 

 12.3 

 11.8 

 11.0 

 11.5 

 12.7 

 12.4 

 12.3 

 11.3 

 12.4 

 11.5 

 11.7 

 10.8 

 11.9 

 11.2 

 10.4 

 11.7 

 10.9 

 8.9 

 7.7 

 8.2 

 8.4 

 6.9 

 7.9 



Head 

 length 



36.7 

 35.4 

 33.9 

 32.9 

 35.7 

 33.1 

 32.8 

 33.5 

 35.0 

 36.4 

 31.7 

 36.0 

 31.8 

 33.4 

 33.7 

 34.2 

 31.8 

 31.3 

 32.6 

 32.4 

 33.9 

 34.8 

 34.1 

 33.8 

 31.7 

 31.5 

 33.2 

 32.6 

 32.1 

 34.4 

 34.8 

 35.0 

 35.7 

 33.9 

 33.3 

 33.0 

 33.6 

 32.1 

 36.0 

 32.4 

 33.3 

 32.1 

 28.9 

 26.0 

 26.3 

 28.1 

 25.7 

 27.4 



Pec- 

 toral 

 fln 

 length 



23.4 



20.9 

 20.5 

 23.5 

 22.1 

 22 

 19.7 

 22.5 

 22.4 

 21.1 

 21.8 

 21.7 

 22.7 

 22.0 

 19.9 

 23.8 

 23.1 

 21.6 

 22.1 

 20.8 

 22.3 

 21.7 

 23.0 

 21.9 

 21.3 

 22.1 

 21.3 

 22.3 

 21.1 



21.1 

 21.6 

 22.2 

 22.4 

 22.2 

 22.6 

 21.9 

 22.1 

 21.6 

 20.4 

 22.6 

 21.7 

 20.9 

 17.5 

 17.7 

 18.2 

 16.9 

 17.3 



' Specimens from northern Bahamas (Including Antilles Current and 

 excluding Florida Current. 



' Specimens captured beyond the -Atlantic coast of the United States and 

 the northern Bahamas. 



This key is designed for specimens larger than 

 about 16 mm., appro.xmiately the size at which 

 gill rakers are sufficiently foniied to be used in 

 separation (fig. 21). The dorsal and anal soft- 

 rays may be used in separation of specimens as 

 small as 8.5 mm. (fig. 20). 



A. Total dorsal and anal soft -rays, 23 or 24 (rarely 21 or 



22). Dorsal rays, 12 (rarely 11 or 13). Anal rays, 

 11 (rarely 9 or 12). Gill rakers on first arch; lower 

 limb, 17 or 18 (rarely 16 or 19) ; entire arch, 22 to 26 

 (rarely 27) ; ceratobranchial bone, 12 or 13 (rarely 

 11) under 150 mm. and 13 or 14 over 150 mm. 



Kyphosus sectatrix (Linnaeus). 



B. Total dorsal and anal soft-rays, 25 to 27 (rarely 28). 



Dorsal rays, 13 or 14 (rarely 15). Anal rays 12 or 

 13. Gill rakers on first arch; lower limb, 19 to 22 

 (rarely 23); entire arch, 25 to 30 (rarely 31); 

 ceratobranchial bone, 14 or 15 (rarely 13) under 

 150 mm. and 15 over 150 mm. 



Kyphosus incisor (Cuvier) 



DISTRIBUTION ALONG THE ATLANTIC COAST OF 

 UNITED STATES AND NORTHERN BAHAMAS 



The extension of records of K. incisor north to 

 Cape Cod makes the northern known range in the 

 western North Atlantic the same for both K. 

 sectatrix and K. incisor. Juveniles of both species 

 were frequently caught under the same patch of 

 Sanjassum; however, Longley and Hildebrand 

 (1941) reported the adults of K. sectatrix and 

 K. incisor to school around different coral reefs at 

 Tortugas, Fla. 



There is little apparent difference in the length 

 of spawning seasori. In the Bahamas, 8 K. sec- 

 tatrix less than 40 nun. were taken in the winter; 

 the only specimens of K. incisor less than 40 mm. 

 were taken in the simimer (figs. 5 and 11). 



LITERATURE CITED 



Anderson, William W. 



1957. Early development, spawning, growth, and 

 occurrence of the silver mullet (Mugil curema) 

 along the south Atlantic coast of the Ignited States. 

 U.S. Department of the Interior, Fish and Wildlife Serv- 

 ice, Fishery Bulletui, No. 119, vol. 57, p. 397-414. 



Anderson, William W., and Jack W. Gehrinoer. 



1957a. Physical oceanographic, biological, and chem- 

 ical data south Atlantic coast of the United States 

 Theodore i\. Gill cruise 3. U.S. Department of the 

 Interior, Fish and Wildlife Service, Special Scien- 

 tific Report — Fisheries No. 210. 208 p. 



1957b. Physical oceanographic, biological, and chem- 

 ical data south Atlantic coast of the United States 

 M/V Theodore N. Gill cruise 4. U.S. Department of 

 the Interior, Fish and Wildlife Service, Special 

 Scientific Report — Fisheries No. 234. 192 p. 



1958a. Physical oceanographic, biological, and chem- 

 ical data .south Atlantic coast of the United States 

 M/V Theodore N. Gill cruise 5. l^S. Department 

 of the Intel ior, Fish and Wildlife Service. Special 

 Scientific Report — Fisheries No. 248. 220 p. 



1958b. Physical oceanographic, biological, and chem- 

 ical data south Atlantic coast of the United States 



