Site Fidelity and Movement of Eight Species of Pacific Rockfish at a High‐Relief Rocky Reef on the Oregon Coast

Hannah, Robert W.; Rankin, Polly S.

doi:10.1080/02755947.2011.591239

Cited by 34 publications

(33 citation statements)

References 15 publications

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“…Our model results showed that for all size groups and areas of occupancy, sablefish are extremely mobile relative to many demersal marine fish (e.g., Hannah and Rankin 2011). The implications of our analysis are that sablefish are more mobile than previously thought, and fish originally tagged in the west have longer lifetime movements than fish originally tagged in the east.…”

Section: Movementmentioning

confidence: 58%

Move it or lose it: movement and mortality of sablefish tagged in Alaska

HanselmanDana

HeifetzJonathan

EchaveKaty

et al. 2015

Can. J. Fish. Aquat. Sci.

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A basic step in understanding the dynamics of a fish population is to quantify movement and mortality rates. Conventional mark-recapture experiments have provided the foundation for studies on animal movement, particularly for fish. Previous studies have shown rapid mixing of sablefish (Anoplopoma fimbria) among fishery regulatory areas, with the pattern of movement related to fish size. Over 300 000 tag releases in Alaska and over 27 000 tag recoveries from 1979 to 2009 were analyzed. We used a Markov model to quantify annual movement probabilities among areas for three size groups of sablefish. The negative-binomial likelihood was used to model the tag-recovery data because of significant overdispersion. Annual movement probabilities were high, ranging from 10% to 88% depending on area of occupancy at each time step and size group. Overall, movement probabilities were very different between areas of occupancy and moderately different between size groups. Estimated annual movement of small sablefish from the central Gulf of Alaska had the reverse pattern of a previous study, with 29% moving westward and 39% moving eastward. Movement probabilities also varied annually, with decreasing movement until the late 1990s and increasing movement until 2009. Year-specific magnitude in movement probability of large fish was highly negatively correlated with female spawning biomass estimates from the federal stock assessment. Mean mortality estimates from time at liberty were similar to the federal stock assessment. Incorporating these tag-recovery and movement data into a fully age-structured spatial stock assessment model will inform harvest apportionment strategies to conserve spawning biomass and maximize future yields.

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Section: Movementmentioning

confidence: 58%

Move it or lose it: movement and mortality of sablefish tagged in Alaska

HanselmanDana

HeifetzJonathan

EchaveKaty

et al. 2015

Can. J. Fish. Aquat. Sci.

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“…35 km for the Willapa line). Other tag detections were obtained from arrays of receivers maintained by the authors in Puget Sound (Andrews et al , 2010) or by researchers studying coastal habitats and embayments along the Pacific Ocean coast of North America (Parker et al , 2008; Hannah & Rankin, 2011) (see Table I for details).…”

Section: Methodsmentioning

confidence: 99%

Scale and pattern of broadnose sevengill shark Notorynchus cepedianus movement in estuarine embayments

Williams

Andrews

Katz

et al. 2012

Journal of Fish Biology

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The detailed movements of 32 acoustically tagged broadnose sevengill shark Notorynchus cepedianus were documented in and around north-east Pacific Ocean estuarine embayments from 2005 to 2007. Arrangements of passive acoustic receivers allowed analysis of movement at several spatial scales, with sex and size examined as possible factors influencing the pattern and timing of these movements. Notorynchus cepedianus exhibited a distinctly seasonal pattern of estuary use over three consecutive years, entering Willapa Bay in the spring, residing therein for extended periods of time during the summer and dispersing into nearshore coastal habitats and over the continental shelf during the autumn. Notorynchus cepedianus within Willapa Bay showed spatio-temporal patterns of segregation by size and sex, with males and small females using peripheral southern estuary channels early in the season before joining large females, who remained concentrated in central estuary channels for the entire season. Individuals displayed a high degree of fidelity not only to Willapa Bay (63% were documented returning over three consecutive seasons), but also to specific areas within the estuary, showing consistent patterns of site use from year to year. Cross-estuary movement was common during the summer, with most fish also moving into an adjacent estuarine embayment for some extent of time. Most winter and autumn coastal detections of N. cepedianus were made over the continental shelf near Oregon and Washington, U.S.A., but there were also examples of individuals moving into nearshore coastal habitats further south into California, suggesting the feasibility of broad-scale coastal movements to known birthing and nursery grounds for the species. These findings contribute to a better understanding of N. cepedianus movement ecology, which can be used to improve the holistic management of this highly mobile apex predator in regional ecosystems.

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“…Still image from video lander footage at Stonewall Bank, Oregon, showing a view that is partially obstructed on the right by nearby rock with a yellowtail rockfish (Sebastes flavidus) visible in the left foreground and a yelloweye rockfish visible below it in association with crevice habitat. and Rankin, 2011;Love et al, 2002). Although small fish are generally harder to accurately identify from video footage, juvenile yelloweye rockfish have very distinctive striped markings (Fig.…”

Section: Discussionmentioning

confidence: 97%