Alien Rainbow Trout (Oncorhynchus mykiss) (Salmoniformes: Salmonidae) Diet in Hawaiian Streams
Date
1999-07
Contributor
Advisor
Department
Instructor
Depositor
Speaker
Researcher
Consultant
Interviewer
Narrator
Transcriber
Annotator
Journal Title
Journal ISSN
Volume Title
Publisher
University of Hawai'i Press
Volume
Number/Issue
Starting Page
Ending Page
Alternative Title
Abstract
Diet of rainbow trout, Oncorhynchus mykiss (Walbaum), introduced
by the State of Hawai'i into tropical headwater streams of the Waimea
River in the Koke'e area of the Hawaiian island of Kaua'i, was examined in this
study through gut content analysis. In Wai'alae Stream, rainbow trout were
found to be opportunistic general predators efficient at feeding on invertebrate
drift. Foods eaten ranged from juvenile trout, to terrestrial and aquatic arthropods,
to algae and aquatic mosses. Native aquatic species, particularly dragonfly
(Anax strennus) and damselfly (Megalagrion heterogamias) naiads, lyrnnaeid
snails (Erinna aulacospira), and atyid shrimp (Atyoida bisulcata), were determined
to be major foods for alien trout. Terrestrial invertebrates (primarily arthropods),
however, provided a substantial (albeit unpredictable) additional
food supply. Based on results of the study, it is cautioned that large numbers
of rainbow trout indiscriminantly released into lower- to middle-elevation
reaches of Hawaiian streams could do substantial damage to populations of native
aquatic species through predation, competition, and/or habitat alteration.
Description
Keywords
Citation
Kido MH, Heacock DE, Asquith A. 1999. Alien rainbow trout (Oncorhynchus mykiss) (Salmoniformes: Salmonidae) diet in Hawaiian streams. Pac Sci 53(3): 242-251.
Extent
Format
Geographic Location
Time Period
Related To
Related To (URI)
Table of Contents
Rights
Rights Holder
Local Contexts
Collections
Email libraryada-l@lists.hawaii.edu if you need this content in ADA-compliant format.