. The Canadian field-naturalist. 1986 Lien and Fawcett: Basking Sharks in Newfoundland 249 Table 1. Incidental inshore catch of Basiling Shari<s (1980-1983) and mean weekly surface temperature (2^-'C). Catch Temperature 1980 1981 1982 1983 Total Percentage 2 0 0 0 0 0 0 4 0 0 0 1 1 6 3 8 0 5 16 8 16 47 16 57 135 10 20 35 5 28 88 12 12 12 11 50 85 14 0 5 3 5 13 16 0 4 0 0 4 18 0 0 0 0 0 0 Table 2. Dates of verified Basking Shark incidental catches (1980-1983). Date 1980 1981 1982 1983 Total 16-29 May 30 May-12 June 13-26 June 27 June-10 July 11-24 July 25 July-
. The Canadian field-naturalist. 1986 Lien and Fawcett: Basking Sharks in Newfoundland 249 Table 1. Incidental inshore catch of Basiling Shari<s (1980-1983) and mean weekly surface temperature (2^-'C). Catch Temperature 1980 1981 1982 1983 Total Percentage 2 0 0 0 0 0 0 4 0 0 0 1 1 6 3 8 0 5 16 8 16 47 16 57 135 10 20 35 5 28 88 12 12 12 11 50 85 14 0 5 3 5 13 16 0 4 0 0 4 18 0 0 0 0 0 0 Table 2. Dates of verified Basking Shark incidental catches (1980-1983). Date 1980 1981 1982 1983 Total 16-29 May 30 May-12 June 13-26 June 27 June-10 July 11-24 July 25 July-7 August 8-22 August 23 August-6 September 7-20 September Totals 0 0 0 1 1 0 2 1 9 12 1 53 5 61 120 9 18 9 40 76 17 20 4 20 61 17 5 5 6 33 5 10 9 1 25 2 2 2 0 6 0 1 0 7 8 51 111 35 145 342. Figure 2. Locations of incidentally caught Basking Sharks by sex (1980-1983). only animals visible at the surface but also animals swimming considerably deeper. If females more commonly swim in surface water, and are therefore visible, and males swim in the same area but at greater depths, susceptibility to incidental catch in fishing gear and directed fisheries would vary by sex. It is possible that a difference in surface activities of males and females is associated with sexual activity. Reports of incidental catch from 1980-1983 and retrospective surveys from 1970-1980 are consistent. However, in 1981, a significant increase in the catch occurred. We believe that a subtle change in actual effort accounts for this increase. In 1981, markets developed for fins and liver so fishermen could sell incidentally caught sharks. In previous years, when Basking Sharks appeared in abundance in an area, fishermen would remove their salmon nets from the water to prevent gear damage. Because of the market in 1981 this was not the case. Markets remained high in 1982 but Basking Shark catches on the southwest coast, in particular, were low. In 1982, inshore water on the Nova Scotia side of the Laurentian
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