. Jan ' Feb Mdr Apr Mavj Fig. 105. Sei wiiale. Monthly catches at South Georgia, 1927-31. species available. Consequently the peak in the graph may indicate the absence of Fin and Blue whales rather than the great influx of Sei whales. Nevertheless Sei whales, like the Fin and Blue whales, undoubtedly pursue a south- ward feeding migration during the southern summer and a northward one to warmer waters for breeding in the winter; but if more extensive figures were available it is possible that the graph of their occurrence would not have so sharp and well marked a peak as has that derived from
. Jan ' Feb Mdr Apr Mavj Fig. 105. Sei wiiale. Monthly catches at South Georgia, 1927-31. species available. Consequently the peak in the graph may indicate the absence of Fin and Blue whales rather than the great influx of Sei whales. Nevertheless Sei whales, like the Fin and Blue whales, undoubtedly pursue a south- ward feeding migration during the southern summer and a northward one to warmer waters for breeding in the winter; but if more extensive figures were available it is possible that the graph of their occurrence would not have so sharp and well marked a peak as has that derived from the figures of the whaling catch. The Sei whale scarcely appears at all in the whaling returns from places farther south, so that the unimodal graph of its occurrence at South Georgia is probably a correct indication of the approximate latitude in which the return towards the north occurs. It may be mentioned also that the whalers believe that with the arrival of the Sei whales the best part of the season for Blue and Fin whales is over; but as pointed out above.
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