A new species of Sebastes (Scorpaeniformes: Sebastidae) from the northeastern Pacific, with a redescription of the blue rockfish, S. mystinus (Jordan and Gilbert, 1881)

Frable, Benjamin W.; Wagman, D. Wolfe; Frierson, Taylor; Aguilar, Andres; Sidlauskas, Brian L.

doi:10.7755/fb.113.4.1

Cited by 23 publications

(27 citation statements)

References 10 publications

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“…The deacon rockfish Sebastes diaconus Frable, Wagman, Frierson, Aguilar, and Sidlauskas () was recently distinguished as a separate species from the blue rockfish Sebastes mystinus (Jordan & Gilbert, 1881). Although superficially similar, these species represent distinct genetic lineages and exhibit key phenotypic differences such as body coloration and cranial morphology (Burford, ; Burford & Bernardi, ; Burford, Carr, & Bernardi, ; Cope, ; Frable et al, ; Hannah, Wagman, & Kautzi, ). These species occur in sympatry from northern California to central Oregon; however, the deacon rockfish has a more northern distribution—extending to Vancouver Island, British Columbia, whereas the blue rockfish is more southern—reaching northern Baja California (Frable et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…Deacon rockfish inhabit a wide depth range, occurring from the shallow intertidal zone to depths >70 m (Frable et al, ; M. T. O. Blume unpublished data). Recent tagging research suggests that deacon rockfish have very small home ranges and do not migrate after settlement (P. S. Rankin, unpublished data).…”

Section: Introductionmentioning

confidence: 99%

“…The deacon rockfish Sebastes diaconus Frable, Wagman, Frierson, Aguilar, and Sidlauskas (2015) was recently distinguished as a separate species from the blue rockfish Sebastes mystinus (Jordan & Gilbert, 1881). Although superficially similar, these species represent distinct genetic lineages and exhibit key phenotypic differences such as body coloration and cranial morphology (Burford, 2009;Burford & Bernardi, 2008;Burford, Carr, & Bernardi, 2011;Cope, 2004;Frable et al, 2015;Hannah, Wagman, & Kautzi, 2015).…”

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confidence: 99%

“…These species occur in sympatry from northern California to central Oregon; however, the deacon rockfish has a more northern distribution-extending to Vancouver Island, British Columbia, whereas the blue rockfish is more southern-reaching northern Baja California (Frable et al, 2015). Given the previous coupling of the two species, little is known about demographic, ecological, and genetic variation within deacon rockfish.…”

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confidence: 99%

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Sex matters: Otolith shape and genomic variation in deacon rockfish (Sebastes diaconus)

Vaux

Rasmuson

Kautzi

et al. 2019

Ecology and Evolution

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Little is known about intraspecific variation within the deacon rockfish (Sebastes diaconus), a recently described species found in the northeast Pacific Ocean. We investigated population structure among fish sampled from two nearshore reefs (Siletz Reef and Seal Rock) and one offshore site (Stonewall Bank) within a <50‐km2 area off the Oregon coast. Fish from the three sample sites exhibited small but statistically significant differences based on genetic variation at >15,000 neutral loci, whether analyzed independently or classified into nearshore and offshore groups. Male and females were readily distinguished using genetic data and 92 outlier loci were associated with sex, potentially indicating differential selection between males and females. Morphometric results indicated that there was significant secondary sexual dimorphism in otolith shape, but further sampling is required to disentangle potential confounding influence of age. This study is the first step toward understanding intraspecific variation within the deacon rockfish and the potential management implications. Since differentiation among the three sample sites was small, we consider the results to be suggestive of a single stock. However, future studies should evaluate how the stock is affected by differences in sex, age, and gene flow between the nearshore and offshore environments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Sex matters: Otolith shape and genomic variation in deacon rockfish (Sebastes diaconus)

Vaux

Rasmuson

Kautzi

et al. 2019

Ecology and Evolution

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“…We conducted this analysis on a single lander deployment at the nearshore reef that captured video of a large mixed-size school of rockfish Sebastes spp. This school contained large numbers of the two cryptic species previously called Blue Rockfish S. mystinus, including the actual Blue Rockfish S. mystinus, as well as large numbers of the Deacon Rockfish S. diaconus (Frable et al 2015). For this analysis, we graphed the maximum range estimate for each 3 cm fork length interval.…”

Section: Methodsmentioning

confidence: 99%

Variation in the Effective Range of a Stereo‐Video Lander in Relation to Near‐Seafloor Water Clarity, Ambient Light and Fish Length

Hannah

Blume

2016

Mar Coast Fish

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We studied how variation in seafloor water clarity, ambient light, and fish fork length influenced the maximum detection range of fish with a stereo‐video lander on three temperate reefs of different depths (12–40, 44–91, and 144–149 m). Although the results are somewhat approximate and specific to the camera system, the methods we used can be applied to any stereo remote underwater visual survey system. In the 52 total lander deployments distributed between nearshore, mid‐shelf and deep‐shelf reefs in Oregon waters, seafloor light levels varied over 4 orders of magnitude, primarily as a function of depth. The seafloor scattering index was higher (low water clarity) and highly variable at the nearshore reef and lower (high water clarity) and less variable at the deeper reefs. In the 15 deployments with sufficient numbers of fish for detection range analysis, the mean maximum range of detection across species varied from 3.89 to 4.23 m at the deep‐shelf reef, 3.32–5.55 m at the mid‐shelf reef, and 1.57–3.42 m at the nearshore reef. Multiple regression analysis of the analyzed deployments showed a strong negative relationship between mean maximum detection range and the scattering index but no relationship with loge of seafloor ambient light. The lack of a light effect showed that the artificial lights were adequately illuminating the field of view in which fish were identifiable, potentially an important system test for sampling across a range of seafloor light levels. Analysis of detection range versus fish fork length for Blue Rockfish Sebastes mystinus and Deacon Rockfish S. diaconus from a single deployment showed a reduction in detection range for 10–20‐cm fish of about 1.15 m relative to the detection range of 25–45‐cm fish, or about 41%. Received September 29, 2015; accepted December 14, 2015

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Cross‐Shelf Variability of Deacon Rockfish Sebastes diaconus Age, Growth, and Maturity in Oregon Waters and Their Effect on Stock Status

et al. 2021

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Understanding the basic biology of exploited fish populations, and how it changes across the waterscape, is essential to sustainable management. Biological features (age, growth, reproductive investment, and fish condition) for the newly described Deacon Rockfish Sebastes diaconus were evaluated between two different population segments, an exploited nearshore population and an unexploited offshore population, and were used to parameterize population dynamics models to evaluate how area-specific biological features influence measures of stock status. Monthly hookand-line sampling was conducted for 1 year, with~50 fish collected per area per sampling period. Despite the relatively small (<50 km) distance between the two sampling areas, there were discernible differences in the biology of Deacon Rockfish. When fish of the same size-class were compared between offshore and nearshore segments, the unexploited offshore fish were older, suggesting that fishing may have decreased the overall age structure of the exploited nearshore population segment. Parameters of the von Bertalanffy growth model differed the most between the sexes and secondarily between the nearshore and offshore population segments. Length at 50% maturity was 28 cm and age at 50% maturity was 4.1 years for females, which is smaller and younger than previously reported in the literature. Deacon Rockfish were captured in both the nearshore and offshore areas throughout the year, which suggests that at least some component(s) of the population is present in both areas throughout the year. These differences had a nontrivial influence on measures of stock status and will be important to consider during future stock assessments and as management considers the effect of the recent reopening of the offshore population segment to fishing.

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A new species of Sebastes (Scorpaeniformes: Sebastidae) from the northeastern Pacific, with a redescription of the blue rockfish, S. mystinus (Jordan and Gilbert, 1881)

Cited by 23 publications

References 10 publications

Sex matters: Otolith shape and genomic variation in deacon rockfish (Sebastes diaconus)

Sex matters: Otolith shape and genomic variation in deacon rockfish (Sebastes diaconus)

Variation in the Effective Range of a Stereo‐Video Lander in Relation to Near‐Seafloor Water Clarity, Ambient Light and Fish Length

Cross‐Shelf Variability of Deacon Rockfish Sebastes diaconus Age, Growth, and Maturity in Oregon Waters and Their Effect on Stock Status

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