Dissertation/Thesis Abstract

The effects of ocular trauma on the visual performance of post-recompressed rockfish (Sebastes) using optokinetic response (OKR)
by Rogers, Bonnie L., M.S., California State University, Long Beach, 2010, 53; 1490414
Abstract (Summary)

Rockfish (Sebastes) suffer extreme ocular trauma (exophthalmia) during fishingascent when swim-bladder gas escapes and expands throughout the body. Unwanted discarded fish are buoyant and often incur mortality if not assisted to depth for recompression. While recompression leads to high short-term survival, the long-term consequences of exophthalmia have remained in question. Twelve rapidly decompressed rosy rockfish ( Sebastes rosaceus) exhibiting exophthalmia, were placed in hyperbaric chambers for 4 days to recompress gases and then slowly decompressed to sea-level pressures. Thereafter, their vision was assessed using an optokinetic reflex test (OKR), and again after one-month recovery. Eye movement rate increased significantly, and fish tracked smaller and faster moving stimuli over time. Percent exophthalmia did not significantly affect eye movement rate. Stretched optic nerves and/or muscles during exophthalmia likely recover quickly as indicated by increased visual performance over time. These findings may be beneficial in developing appropriate management strategies for declining rockfish fisheries.

Indexing (document details)
Advisor: Lowe, Chris
School: California State University, Long Beach
School Location: United States -- California
Source: MAI 49/04M, Masters Abstracts International
Subjects: Zoology, Forestry
Publication Number: 1490414
ISBN: 978-1-124-55028-2
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