5. Improving Fisheries Assessments Using Historical Data: Stock Status and Catch Limits

Friedlander, Alan M.; Nowlis, Joshua Sladek; Koike, Haruko; Kittinger, John N.

doi:10.1525/9780520959606-009

Cited by 8 publications

(9 citation statements)

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“…However, the large‐scale harvest of spawning aggregations led to declines in relative abundance of bonefish in the fishery from 44.6% to 7.5% over a period of 15 years (Beets, ). Similarly, the annual commercial landings of bonefish in Hawaii declined from 136,079 kg at the start of the 19th Century to 1,361 kg by the year 2002 (Friedlander et al, ; Friedlander, Nowlis, & Koike, ). Although the yields of these contemporary fisheries may be partially limited as a result of reduced fishing effort in response to past declines, these trends provide a historical context that suggest bonefish abundance can be reduced by orders of magnitude when heavily exploited and support the low population estimate obtained in the present study.…”

Section: Discussionmentioning

confidence: 99%

Population dynamics of roundjaw bonefish Albula glossodonta at a remote coralline Atoll inform community‐based management in an artisanal fishery

Filous

Lennox

Eveson

et al. 2019

Fisheries Management Eco

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Fisheries management requires knowledge on the population dynamics of exploited stocks. To that end, the present study used a mark–recapture approach to characterise the population demographics of roundjaw bonefish Albula glossodonta (Forsskål) and their interaction with a data‐limited fishery on Anaa Atoll in the Tuamotu Archipelago of French Polynesia. Over the course of the study, 2,509 bonefish were tagged and 12.3% were recaptured. The L∞ of bonefish was estimated at 71 cm fork length (FL) with a K of 0.17, based on changes in FL between capture events. Artisanal fish traps located in the migratory corridors of the atoll accounted for 94% of recaptures and these movements occurred during the waning moon. Fishing mortality increased as bonefish reach sexual maturity, recruiting to the trap fishery at age 4 with the onset of spawning behaviour. Bonefish abundance between ages 3 and 5 was estimated to be 29,079 individuals. This case study demonstrated the utility of mark–recapture in filling knowledge gaps that impede the management of data‐limited fisheries. Ultimately, these results supported the creation of an Educational Managed Marine Area and the resurgence of rahui (seasonal closure) to manage this fishery.

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Section: Discussionmentioning

confidence: 99%

Population dynamics of roundjaw bonefish Albula glossodonta at a remote coralline Atoll inform community‐based management in an artisanal fishery

Filous

Lennox

Eveson

et al. 2019

Fisheries Management Eco

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“…For instance, fishing mortality in the bonefish fishery of Hawaii was estimated at 0.59 and commercial landings have declined to less than 1% of their historic yields (Friedlander et al. , ; Kamikawa et al. ).…”

Section: Discussionmentioning

confidence: 99%

Length‐Based Assessment of an Artisanal Albulid Fishery in the South Pacific: a Data‐Limited Approach for Management and Conservation

et al. 2019

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Data‐limited fisheries assessment methods have great potential to help inform small island communities on the status of their fisheries resources. In this paper, we provide a length‐based assessment of an artisanal fishery that primarily targets spawning aggregations of Shortjaw Bonefish Albula glossodonta at Anaa Atoll in the Tuamotu Archipelago of French Polynesia. We assessed the length‐frequency distribution of the spawning stock across a 3‐year period (2016–2018). During this time, male and female Shortjaw Bonefish were fully recruited to the fishery at age 4 and age 5, respectively. Fishing mortality was over two times the range of natural mortality for this species (i.e., 0.21–0.32), and based on these estimates of natural mortality, the annual spawning potential ratio of the population was between 7% and 20% across the sampling years. The majority of the catch was sexually mature, with 78, 95, and 95% of the annual female catch in 2016, 2017, and 2018, respectively, being equal to or greater than the length of first maturity (i.e., 48 cm FL). However, every fisheries indicator and biological reference point suggested that the fishery was overexploited and in need of management intervention. To this aim, the community of Anaa (1) established an Educational Managed Marine Area, which overlaps with the Shortjaw Bonefish migratory corridor adjacent to Tukuhora village and (2) instated a temporal rahui (a traditional conservation method) inside the Educational Managed Marine Area during the peak months of the spawning season.

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“…As the popularity of this species continues to grow, recreational catch and release tourism for giant trevally could provide alternative livelihoods that improve the stability of coastal communities (Allison and Ellis 2001;Wood et al 2013;Watson et al 2016). However, this species is increasingly threatened by exploitation and anthropogenic development, and as a result understanding their habitat needs is essential to their conservation (Friedlander and Dalzell 2004;Friedlander et al 2015;McLeod 2016). This study provides unique insight into the intra-and inter-individual spatial demands of giant trevally, and ultimately, shows that giant trevally can range widely throughout their respective atolls but occupy relatively small core use areas that coincide with the interface between lagoon and shallow water habitats.…”

Section: Discussionmentioning

confidence: 99%

“…In addition to their importance to recreational fisheries, these predators play an equally important role in maintaining the balance of coral reef ecosystems by imposing a top down effect on lower trophic groups (Sudekum et al 1991). In parts of their distribution where commercial fisheries actively target giant trevally, their numbers have been reduced to a fraction of their historical abundance and they are nearly extirpated from many of these costal ecosystems (Friedlander and DeMartini 2002;Friedlander et al 2015). Large predators like trevally are likely to have a cascading effect on the behavior and abundance of their prey and competitors (Hammerschlag et al 2015), and thus impacts to these predators have the potential to alter the function of the entire ecosystem (Friedlander and DeMartini 2002;Heithaus et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Manual Acoustic Tracking Reveals the Spatial Ecology of Giant Trevally at a Remote South Pacific Atoll, with Implications for Their Management

Filous¹,

Lennox²,

Danylchuk³

et al. 2019

Preprint

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<div>Giant trevally (<i>Caranx ignobilis</i>) are important predators on the reefs of the tropical Indo-Pacific and research into their spatial ecology is needed to improve our understanding of their behavior and assist fisheries management. We used active acoustic telemetry to describe the fine-scale movements of giant trevally at Tetiaroa Atoll, including their home range, site fidelity, habitat use and spatial overlap with a small (21 km2) Marine Protected Area (MPA). The home ranges of giant trevally were small but varied among individuals (Minimum Convex Polygon 𝑋𝑋 = 3.2 ± 2.5 km2). All giant trevally exhibited site fidelity to their respective home ranges with a 31% average overlap in daily space use, but there was limited overlap in home ranges among individuals, with intra-individual spatial overlap significantly greater than inter-individual overlap (t = -4.93, df = 16.87, p-value = <0.001). There was only modest overlap (19 ± 19%) of giant trevally home ranges within the MPA and high spatial overlap of home ranges with deep lagoon habitats (90 ± 0.09 %). Our results indicate that MPAs could be an effective tool for the conservation of this species if they are implemented on an atoll-wide scale. However, in the case of managing recreational catch-and-release fisheries, rotational smallscale temporal closures could be effective in regulating the angling pressure imposed upon giant trevally, provided post-release mortality is minimized. The results of this study provide the first detailed account of habitat use in this species and highlight the need for additional research on the factors contributing to the survival of caught-and-released giant trevally in predator dominated atolls, especially as their popularity as a target of recreational fisheries continues to grow, and fishing operations and agencies are faced with the need to manage their fisheries.</div>

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5. Improving Fisheries Assessments Using Historical Data: Stock Status and Catch Limits

Cited by 8 publications

References 0 publications

Population dynamics of roundjaw bonefish Albula glossodonta at a remote coralline Atoll inform community‐based management in an artisanal fishery

Population dynamics of roundjaw bonefish Albula glossodonta at a remote coralline Atoll inform community‐based management in an artisanal fishery

Length‐Based Assessment of an Artisanal Albulid Fishery in the South Pacific: a Data‐Limited Approach for Management and Conservation

Manual Acoustic Tracking Reveals the Spatial Ecology of Giant Trevally at a Remote South Pacific Atoll, with Implications for Their Management

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