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<br />I <br />I 12 <br />I D. Catch/effort <br /> IICC <br /> 10 <br />I .BB <br /> .GSF <br />I 8 IILMB <br /> N <br />I E <br />0 <br />0 6 <br />~ <br /> - <br />I 0 <br />z <br /> 4 <br />I <br />I 2 <br />I 0 <br /> 1986 1987 1988 1989 1990 1991 <br />I <br />I Figure 1. (continued). <br />I <br />I <br />I <br />I <br />I <br />I <br /> 7 <br />I <br /> <br />