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Migrations and home range shifts by adult blue cod Parapercis colias provide an impor- tant means of dispersal among resident subpopulations within the Doubtful-Thompson Sound com- plex, a fjord system in southwestern New Zealand. In the present study we used stable isotope analy- sis (δ 13 C and δ 15 N) to investigate regional differences in the carbon sources for, and likely migration patterns among, subpopulations of P. colias. We found consistent differences in δ 13 C and δ 15 N of blood and muscle collected from outer coast (mean ± SE: blood, δ 13 C = -18.4 ± 0.2, δ 15 N = 11.5 ± 0.2; muscle, δ 13 C = -17.9 ± 0.1, δ 15 N = 13.0 ± 0.1) and inner fjord (mean ± SE: blood, δ 13 C = -19.9 ± 0.5, δ 15 N = 9.5 ± 0.3; muscle, δ 13 C = -19.3 ± 0.4, δ 15 N = 11.6 ± 0.2) locations, likely reflecting long-term (>1 yr) residency. Inner fjord fish had evidence of significant input of recycled carbon from chemoau- totrophic bacteria. On the outer coast, δ 15 N and δ 13 C reflected a diet likely supported primarily by new production from macroalgae and phytoplankton. To provide information on isotopic turnover rate of blood and muscle we translocated fish from the outer coast to an inner fjord site and measured change in δ 15 N and δ 13 C after 160 d. These data showed a depletion of 13 C and 15 N with shift in habi- tat and provided a basis for classifying likely migrants (<160 d) to each study site. The conclusion that populations of blue cod within Doubtful Sound are made up of long-term residents with some subsidy from the outer coast has implications for the efficacy of 2 newly established marine reserves in Doubt- ful Sound and others in Fiordland.

Spatial structure and movement of blue cod Parapercis colias in Doubtful Sound, New Zealand, inferred from δ13C and δ15N