Figure 9.

Annual survival and fishing rate as estimated for tagging ages >1 over four decenniums. The fishing rates represent dead encounter rates during nonspawning years. Even and odd year spawners have been given separate parameterization as they inhabit the lake (i.e. do not spawn) in different years. Note that the 2000 decennium estimates cover two survival periods only (data series used terminates in 2003). All estimates are adjusted to a mean lake water temperature of 11.8°C and a mean total phosphorus level of 7.4 μg L⁻¹.