. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Marine Hatchetfishes • Baird 51. Figure 33. Geographic variation in gill raker number in A. hemigymnus, pigment forms A and B. A =: NE Atlantic; B = NW Atlantic; C = Gulf of Mexico; D = Mediterranean; E = Indian Ocean; F = Soutfiern Ocean (Pacific); G = N Pacific; H =: Pacific (California). Numbers refer to sample size. of about 35°N along the North African coast and associated islands; essentially absent from the tropical Atlantic; small to moderate catches in the southwestern At- lantic represent this species; taken
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Marine Hatchetfishes • Baird 51. Figure 33. Geographic variation in gill raker number in A. hemigymnus, pigment forms A and B. A =: NE Atlantic; B = NW Atlantic; C = Gulf of Mexico; D = Mediterranean; E = Indian Ocean; F = Soutfiern Ocean (Pacific); G = N Pacific; H =: Pacific (California). Numbers refer to sample size. of about 35°N along the North African coast and associated islands; essentially absent from the tropical Atlantic; small to moderate catches in the southwestern At- lantic represent this species; taken in the central Indian Ocean from about 10°S to 40°S and reported abundant off the easteni South African coast; a few records scat- tered along the western Pacific from north of New Guinea to Japan represent it in the western Pacific; a number of moderate catches indicate its presence in the north central Pacific; these are matched by similar catches off Chile and one large haul off Sidney, Australia. Vertical distribution (Fig. 37): Occurs between 200 m and 550 m by day with the greatest concentrations from 350-450 m; marked diunial movement with major con- centrations from 80-200 m at night; Sar- gasso Sea captures indicate concentrations !at about 520 m by day (Dr. James Crad- :lock, WHOI, personal conversation). Geog^raphic variation. Because of large samples available this species was used for 1 detailed population study in the Atlantic, [t allowed checks to be made of within- lopulation variation both from different vcars and as subsamples of the same catch; urthermore, an examination of samples in the northwest Atlantic provided an op- portunity to look at variations over at least 15° of longitude in the same biogeographic region. Table 8 records these results. In the northwest Atlantic, results indicate that population parameters remain constant in A B C D E F G A B rio 10 1 i_j 14 ni] s I iLl 10 r^£} 17 Cfc 7 rin 13 (ii \o r^ 12 liQ 15 liL 15 rin 13 jM 12 cir ^
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Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
