New Zealand Journal of Marine and Freshwater Research abstracts
Recruitment and distribution of juvenile salmonids in Lake Coleridge, New
Zealand
ERIC GRAYNOTH
National Institute of Water & Atmospheric
Research Ltd
P. O. Box 8602
Christchurch, New Zealand
email: e.graynoth@niwa.cri.nz
Abstract Rainbow trout (
Oncorhynchus mykiss
Richardson) and chinook salmon (
O. tshawytscha Walbaum) fry and 0+
fingerlings entered Lake Coleridge, a deep, oligotrophic lake in the Southern
Alps of New Zealand, in spring and early summer and dispersed throughout the
shallow littoral. In contrast, most juvenile brown trout (
Salmo trutta
Linnaeus)
remained in the tributaries for 1-2 years before migrating
down stream to the lake. Juvenile salmonids (<350 mm) were more
abundant in the shallow littoral (<10 m), especially near tributaries,
than in the deep littoral (10-40 m), or the surface layers (0-16 m)
of the limnetic zone which were populated by yearling (>150 mm) and
adult salmon and rainbow trout (>210 mm). The abundance of 0+ rainbow
trout in the littoral zone declined rapidly from February to August and stocks
were supplemented by a migration of yearling fish from the tributaries in
spring. The shallow littoral zone and tributaries are both important for
juvenile trout rearing in this lake.
Keywords rainbow trout; Oncorhynchus mykiss; brown
trout; Salmo trutta; chinook salmon; Oncorhynchus tshawytscha;
distribution; movements; growth
M98053
Received 3 August 1998; accepted 18 February 1999
PDF file of entire paper: medium quality (1524K); (scanned from paper original: notes about this process)
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