. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 268 DISCOVERY REPORTS 80- > liJ 60 < t; 40 20. Fig. 14. A. (200 m ^ m.) white; also seasonal variation in its frequency of occurrence B on the shelf, and black, and on the shelf C 'over the edge'. Season Spring Summer Autumn Winter Spring Summer Autumn Winter Table 5. Full data relating to Raja brachyurops/)/o«g^ in Fig. 14 On the shelf, depths less than 200 m. No. of individuals 6 62 74 17 % of total caught in each season 60 95 97 14 Over the edge, depths more than 200 m. No. of individua
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 268 DISCOVERY REPORTS 80- > liJ 60 < t; 40 20. Fig. 14. A. (200 m ^ m.) white; also seasonal variation in its frequency of occurrence B on the shelf, and black, and on the shelf C 'over the edge'. Season Spring Summer Autumn Winter Spring Summer Autumn Winter Table 5. Full data relating to Raja brachyurops/)/o«g^ in Fig. 14 On the shelf, depths less than 200 m. No. of individuals 6 62 74 17 % of total caught in each season 60 95 97 14 Over the edge, depths more than 200 m. No. of individuals No. of hauls 14 65 42 17 No. positive 3 17 18 3 positive 21-4 26-2 42-9 17-6 4 3 2 106 % of total caught in each season 40 5 3 86 No. of hauls 2 10 8 13 No. positive positive SO 10 12-5 38-5 Separate depth-frequency polygons of the type used for summarizing the main features of depth dj nbutton of all elasmobranchs may also be plotted for R. at each season, as m Fig '5 This presents the evidence of seasonal migration even more clearly ^' Very good evidence that the young of R. brachyurops are hatched on the shelf can be obtained bv considering our records of captures of minute post-embryos and yearlings less than zo cm wide' The r seasonal distribution also is so circumscribed as to establish the approximate hatching peT od and they are accordingly tabulated in full (Table 6) naicning period, 3oMaThaLTMlv'lltt' 't '"" V"' T'"''''^'' ^^^ ^"^^" ^^^^^^^^ -- -"g^^ between xcfp ons I'o cm Id f T'n . ' '""'"' observations were made at other seasons. Of the exceptions, the 9 cm. individual in October was presumably a late-hatched survivor of the previous. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Institute of Oceanographic Sciences (Great Brita
Size: 1710px × 1462px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
