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Short-Term Fidelity, Habitat Use and Vertical Movement Behavior of the Black Rockfish Sebastes schlegelii as Determined by Acoustic Telemetry.

Zhang Y, Xu Q, Alós J, Liu H, Xu Q, Yang H - PLoS ONE (2015)

Bottom Line: The preference of this species for the artificial reefs that were recently deployed in the study area suggests that artificial seascapes may be effective management tools to attract individuals.The vertical movement of tagged S. schlegelii was mostly characterized by bottom dwelling behavior, and there was high individual variability in the vertical migration pattern.Our results have important implications for S. schlegelii catchability, the implementation of marine protected areas, and the identification of key species habitats, and our study provides novel information for future studies on the sustainability of this important marine resource in eastern China.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; University of Chinese Academy of Sciences, Beijing, China.

ABSTRACT
The recent miniaturization of acoustic tracking devices has allowed fishery managers and scientists to collect spatial and temporal data for sustainable fishery management. The spatial and temporal dimensions of fish behavior (movement and/or vertical migrations) are particularly relevant for rockfishes (Sebastes spp.) because most rockfish species are long-lived and have high site fidelity, increasing their vulnerability to overexploitation. In this study, we describe the short-term (with a tracking period of up to 46 d) spatial behavior, as determined by acoustic tracking, of the black rockfish Sebastes schlegelii, a species subject to overexploitation in the Yellow Sea of China. The average residence index (the ratio of detected days to the total period from release to the last detection) in the study area was 0.92 ± 0.13, and most of the tagged fish were detected by only one region of the acoustic receiver array, suggesting relatively high site fidelity to the study area. Acoustic tracking also suggested that this species is more frequently detected during the day than at night in our study area. However, the diel detection periodicity (24 h) was only evident for certain periods of the tracking time, as revealed by a continuous wavelet transform. The habitat selection index of tagged S. schlegelii suggested that S. schlegelii preferred natural reefs, mixed sand/artificial reef bottoms and mixed bottoms of boulder, cobble, gravel and artificial reefs. The preference of this species for the artificial reefs that were recently deployed in the study area suggests that artificial seascapes may be effective management tools to attract individuals. The vertical movement of tagged S. schlegelii was mostly characterized by bottom dwelling behavior, and there was high individual variability in the vertical migration pattern. Our results have important implications for S. schlegelii catchability, the implementation of marine protected areas, and the identification of key species habitats, and our study provides novel information for future studies on the sustainability of this important marine resource in eastern China.

No MeSH data available.


Wavelet sample spectrums using a Morlet wavelet for 3 control tags.Continuous thin lines represent the cone of influence (COI). Values outside the COI should not be interpreted due to edge effects. Thick contours represent the 95% confidence level and scale bar represents the intensity of the time-frequency space over time. The pattern without diel periodicity is indicated by the lack of thick contours on a 24 h scale (horizontal dashed line).
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pone.0134381.g006: Wavelet sample spectrums using a Morlet wavelet for 3 control tags.Continuous thin lines represent the cone of influence (COI). Values outside the COI should not be interpreted due to edge effects. Thick contours represent the 95% confidence level and scale bar represents the intensity of the time-frequency space over time. The pattern without diel periodicity is indicated by the lack of thick contours on a 24 h scale (horizontal dashed line).

Mentions: The temporal pattern of detections was assessed for every fish using wavelet spectrums (Fig 5). The diel pattern observed was only evident for certain periods of time and was not consistent across all tracking periods. The pattern of diel periodicity (24 h) was indicated by significant patches at 24 h scale in wavelet spectrums (Fig 5). For example, diel (24 h) periodicity was only evident after 11 August for fish 326, between 4 and 9 August for fish 334 and after tagging for fish 329 (Fig 5). The CWT results for the control tags confirmed that the pattern of significant diel periodicities was related to fish behavior but not environmental factors (see the absence of significant patches at 24 h scale in Fig 6).


Short-Term Fidelity, Habitat Use and Vertical Movement Behavior of the Black Rockfish Sebastes schlegelii as Determined by Acoustic Telemetry.

Zhang Y, Xu Q, Alós J, Liu H, Xu Q, Yang H - PLoS ONE (2015)

Wavelet sample spectrums using a Morlet wavelet for 3 control tags.Continuous thin lines represent the cone of influence (COI). Values outside the COI should not be interpreted due to edge effects. Thick contours represent the 95% confidence level and scale bar represents the intensity of the time-frequency space over time. The pattern without diel periodicity is indicated by the lack of thick contours on a 24 h scale (horizontal dashed line).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4556453&req=5

pone.0134381.g006: Wavelet sample spectrums using a Morlet wavelet for 3 control tags.Continuous thin lines represent the cone of influence (COI). Values outside the COI should not be interpreted due to edge effects. Thick contours represent the 95% confidence level and scale bar represents the intensity of the time-frequency space over time. The pattern without diel periodicity is indicated by the lack of thick contours on a 24 h scale (horizontal dashed line).
Mentions: The temporal pattern of detections was assessed for every fish using wavelet spectrums (Fig 5). The diel pattern observed was only evident for certain periods of time and was not consistent across all tracking periods. The pattern of diel periodicity (24 h) was indicated by significant patches at 24 h scale in wavelet spectrums (Fig 5). For example, diel (24 h) periodicity was only evident after 11 August for fish 326, between 4 and 9 August for fish 334 and after tagging for fish 329 (Fig 5). The CWT results for the control tags confirmed that the pattern of significant diel periodicities was related to fish behavior but not environmental factors (see the absence of significant patches at 24 h scale in Fig 6).

Bottom Line: The preference of this species for the artificial reefs that were recently deployed in the study area suggests that artificial seascapes may be effective management tools to attract individuals.The vertical movement of tagged S. schlegelii was mostly characterized by bottom dwelling behavior, and there was high individual variability in the vertical migration pattern.Our results have important implications for S. schlegelii catchability, the implementation of marine protected areas, and the identification of key species habitats, and our study provides novel information for future studies on the sustainability of this important marine resource in eastern China.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; University of Chinese Academy of Sciences, Beijing, China.

ABSTRACT
The recent miniaturization of acoustic tracking devices has allowed fishery managers and scientists to collect spatial and temporal data for sustainable fishery management. The spatial and temporal dimensions of fish behavior (movement and/or vertical migrations) are particularly relevant for rockfishes (Sebastes spp.) because most rockfish species are long-lived and have high site fidelity, increasing their vulnerability to overexploitation. In this study, we describe the short-term (with a tracking period of up to 46 d) spatial behavior, as determined by acoustic tracking, of the black rockfish Sebastes schlegelii, a species subject to overexploitation in the Yellow Sea of China. The average residence index (the ratio of detected days to the total period from release to the last detection) in the study area was 0.92 ± 0.13, and most of the tagged fish were detected by only one region of the acoustic receiver array, suggesting relatively high site fidelity to the study area. Acoustic tracking also suggested that this species is more frequently detected during the day than at night in our study area. However, the diel detection periodicity (24 h) was only evident for certain periods of the tracking time, as revealed by a continuous wavelet transform. The habitat selection index of tagged S. schlegelii suggested that S. schlegelii preferred natural reefs, mixed sand/artificial reef bottoms and mixed bottoms of boulder, cobble, gravel and artificial reefs. The preference of this species for the artificial reefs that were recently deployed in the study area suggests that artificial seascapes may be effective management tools to attract individuals. The vertical movement of tagged S. schlegelii was mostly characterized by bottom dwelling behavior, and there was high individual variability in the vertical migration pattern. Our results have important implications for S. schlegelii catchability, the implementation of marine protected areas, and the identification of key species habitats, and our study provides novel information for future studies on the sustainability of this important marine resource in eastern China.

No MeSH data available.