Detecting change in density and biomass of a benthic marine invertebrate following commercial fishing

Chick, Rowan C.; Mayfield, Stephen; Burch, P; Turich, S.N.; McGarvey, Richard

doi:10.1016/j.fishres.2012.06.009

Cited by 6 publications

(4 citation statements)

References 41 publications

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“…In this study, GAMM indicated that CPUE was associated with reef complexes in shallow waters that exhibit high seafloor complexity data. Observed coincidences between CPUE and seafloor structure is further supported by a previous study that showed key blacklip abalone fishing grounds were associated with topographically complex reefs [ 57 ]. In addition, it has been well documented that depth and reef complexity represent fundamental characteristics of benthic marine ecosystems that affect a multitude of processes, including species richness and diversity [ 14 , 58 – 61 ].…”

Section: Discussionsupporting

confidence: 76%

Exploring Spatiotemporal Trends in Commercial Fishing Effort of an Abalone Fishing Zone: A GIS-Based Hotspot Model

Jalali

Ierodiaconou

Gorfine³

et al. 2015

PLoS ONE

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Assessing patterns of fisheries activity at a scale related to resource exploitation has received particular attention in recent times. However, acquiring data about the distribution and spatiotemporal allocation of catch and fishing effort in small scale benthic fisheries remains challenging. Here, we used GIS-based spatio-statistical models to investigate the footprint of commercial diving events on blacklip abalone (Haliotis rubra) stocks along the south-west coast of Victoria, Australia from 2008 to 2011. Using abalone catch data matched with GPS location we found catch per unit of fishing effort (CPUE) was not uniformly spatially and temporally distributed across the study area. Spatial autocorrelation and hotspot analysis revealed significant spatiotemporal clusters of CPUE (with distance thresholds of 100’s of meters) among years, indicating the presence of CPUE hotspots focused on specific reefs. Cumulative hotspot maps indicated that certain reef complexes were consistently targeted across years but with varying intensity, however often a relatively small proportion of the full reef extent was targeted. Integrating CPUE with remotely-sensed light detection and ranging (LiDAR) derived bathymetry data using generalized additive mixed model corroborated that fishing pressure primarily coincided with shallow, rugose and complex components of reef structures. This study demonstrates that a geospatial approach is efficient in detecting patterns and trends in commercial fishing effort and its association with seafloor characteristics.

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Section: Discussionsupporting

confidence: 76%

Exploring Spatiotemporal Trends in Commercial Fishing Effort of an Abalone Fishing Zone: A GIS-Based Hotspot Model

Jalali

Ierodiaconou

Gorfine³

et al. 2015

PLoS ONE

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“…The first surveys were undertaken to monitor greenlip density and population structure at Tiparra Reef (central zone) but were gradually extended to key fishing grounds for both species across all three zones. Initial surveys utilized the "timed-swim" method (Shepherd, 1984), but have subsequently been replaced by the "leaded-line" method, following rigorous development and testing (McGarvey et al, 2008;Chick et al, 2012). Third, extensive biological (e.g., Shepherd, 1973;Shepherd et al, 1992;Shepherd and Partington, 1995;Mayfield and Saunders, 2008) and irregular commercial-catch-sampling data (Burch et al, 2010) have been collected for both species, and greenlip weight-grade data have been consistently recorded by western zone processors since 1979 (Mayfield, 2010).…”

Section: Samentioning

confidence: 99%

Fifty Years of Sustained Production from the Australian Abalone Fisheries

Mayfield

Mundy

Gorfine³

et al. 2012

Reviews in Fisheries Science

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The sustained production of abalone from the five state-managed (Tasmania, Victoria, South Australia, New South Wales, and Western Australia) Australian abalone fisheries has contrasted with many of those elsewhere that exhibited rapid and sustained declines in production. Australian abalone fisheries are significant at local, regional, state, national, and international scales. Key attributes are (1) harvesting, processing, and reinvestment of profits occur away from major metropolitan centers; (2) they are among the most valuable wild-catch species in all states; (3) the combined Australian abalone harvest in 2011 (>4,500 t) had a landed value of ∼AU$200M and represented 15% of the Australian total wild-catch production; and (4) this level of production made these fisheries the dominant contributor (60%) to global wild-catch abalone production. Unlike many other abalone fisheries, total catches were controlled by limited entry, quotas, size limits, and geographic boundaries, overseen by stringent compliance regimes, early in their history. Subsequently, state-based research programs, explicitly tasked with providing scientific advice to support management decisions, undertook assessments to match harvests with stock productivity. This information upon which to base management decisions contributed to long-term (>20 years) stable harvests and enabled relationships among stakeholders to develop around consideration of the information and advice for management. In general, rights-holders developed stewardship for the resource, and this has led to numerous important outcomes, including evolving resource co-management and a nationally representative industry entity, the Abalone Council of Australia. The Abalone Council of Australia, state-based industry entities, and ongoing relationships among rights-holders, fishery managers, and researchers play vital roles in addressing and overcoming current and impending challenges for these fisheries. These difficulties include (1) urban encroachment into coastal regions (the so-called "sea change" phenomenon); (2) a growing interest in access to the abalone resource, reflecting the increasing, culturally diverse Australian population; (3) the everpresent threat of illegal fishing; (4) recent total allowable commercial catch reductions, particularly in Victoria and New South Wales, to facilitate stock rebuilding; (5) changing market conditions; (6) declining profitability from increasing operational costs and appreciation of the Australian dollar; and (7) environmental changes, such as prolonged drought and warmer seas associated with shifts in climate. Overall, this review demonstrates that abalone can be harvested sustainably over extended periods, despite aspects of their demography that suggest higher vulnerability to overexploitation, providing the management systems that control harvesting activities and external impacts that encompass several key underpinning elements. This review also identifies likely challenges to sustained production and shows that the future of ...

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“…Estimates of density and biomass are among the more useful quantities for stock assessment to provide fishery managers with information for management strategy decisions, particularly in a quota-managed benthic fishery such as abalone where biomass and abundance may also be related to substratum variability (Chick et al 2012). Estimates of density and biomass are among the more useful quantities for stock assessment to provide fishery managers with information for management strategy decisions, particularly in a quota-managed benthic fishery such as abalone where biomass and abundance may also be related to substratum variability (Chick et al 2012).…”

Section: Discussionmentioning

confidence: 99%

“…There was a significant disease (AVG) impact on blacklip abalone stocks in the Western and Central zones of the Victorian abalone fishery, with abundance patterns varying in line with variations in ecologically important habitat metrics derived from high-quality bathymetric LiDAR. Estimates of density and biomass are among the more useful quantities for stock assessment to provide fishery managers with information for management strategy decisions, particularly in a quota-managed benthic fishery such as abalone where biomass and abundance may also be related to substratum variability (Chick et al 2012). Measuring these factors facilitates an understanding of the resilience of abalone stocks and their recovery following major disturbances such as AVG.…”

Section: Discussionmentioning

confidence: 99%

Spatial abundance patterns and recruitment of a virus‐affected commercial mollusc fishery

Jalali

Ierodiaconou

Gorfine

et al. 2015

Fisheries Management Eco

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Infectious pathogens figure prominently among those factors threatening marine wildlife. Mass mortality events caused by pathogens can fundamentally alter the structure of wild fish stocks and depress recruitment rates and yield. In the most severe instances, this can precipitate stock collapses resulting in dramatic economic losses to once valuable commercial fisheries. An outbreak of a herpes‐like virus among commercially fished abalone populations in the south‐west fishery of Victoria, Australia, during 2006–2007, has been associated with high mortality rates among all cohorts. Long‐term records from fishery‐independent surveys of blacklip abalone Haliotis rubra (Leach) enabled abundance from pre‐ and post‐viral periods to be analysed to estimate stock density and biomass. The spatial distribution of abundance in relation to physical habitat variables derived from high‐resolution bathymetric LiDAR data was investigated. Significant differences were observed in both measures between pre‐ and post‐viral periods. Although there was some limited evidence of gradual stock improvement in recent years, disease‐affected reefs have remained below productivity rates prior to the disease outbreak suggesting a reduction in larval availability or settlement success. This was corroborated by trends in sublegal sized blacklip abalone abundance that has yet to show substantial recovery post‐disease. Abundance data were modelled as a function of habitat variables using a generalised additive model (GAM) and indicated that high abundance was associated with complex reef structures of coastal waters (<15 m). This study highlights the importance of long‐term surveys to understand abalone recovery following mass mortality and the links between stock abundance and seafloor variability.

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Detecting change in density and biomass of a benthic marine invertebrate following commercial fishing

Cited by 6 publications

References 41 publications

Exploring Spatiotemporal Trends in Commercial Fishing Effort of an Abalone Fishing Zone: A GIS-Based Hotspot Model

Exploring Spatiotemporal Trends in Commercial Fishing Effort of an Abalone Fishing Zone: A GIS-Based Hotspot Model

Fifty Years of Sustained Production from the Australian Abalone Fisheries

Spatial abundance patterns and recruitment of a virus‐affected commercial mollusc fishery

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