Shane Griffiths

Shane Griffiths
Inter-American Tropical Tuna Commission | IATTC · Ecosystems Program

PhD

About

109
Publications
56,877
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
4,040
Citations
Citations since 2016
31 Research Items
2268 Citations
20162017201820192020202120220100200300
20162017201820192020202120220100200300
20162017201820192020202120220100200300
20162017201820192020202120220100200300
Additional affiliations
January 2022 - present
Inter-American Tropical Tuna Commission
Position
  • Senior Ecosystem Scientist
August 2019 - January 2022
Inter-American Tropical Tuna Commission
Position
  • Head of Department
September 2016 - August 2019
Inter-American Tropical Tuna Commission
Position
  • Senior Researcher
Education
March 1999 - March 2002
University of Wollongong
Field of study
  • Marine Fish Ecology
March 1994 - March 1998

Publications

Publications (109)
Article
Full-text available
In fisheries, vulnerability assessments—also commonly known as ecological risk assessments (ERAs)—have been an increasingly popular alternative to stock assessments to evaluate the vulnerability of non-target species in resource- and data-limited settings. The widely-used productivity−susceptibility analysis (PSA) requires detailed species-specific...
Article
Full-text available
Longtail tuna (Thunnus tonggol) is a neritic species that supports commercial, artisanal and recreational fisheries throughout the Indo-Pacific region. Historically receiving little attention by commercial fisheries, the global annual catch of longtail tuna has steadily risen from around 30,000 t in the early 1980s to exceeding 200,000 t since 2004...
Article
Full-text available
The global catch of longtail tuna (Thunnus tonggol) has almost tripled over the past two decades, with recent stock assessments suggesting overexploited stocks. Nine longtail tuna were tracked for 2–115 days with pop-up satellite archival tags off eastern Australia (27.5°S 153.4°E to 27.5°S 153.4°E) to better understand their movements, habitat spe...
Article
Full-text available
Oceanic whitetip shark (Carcharhinus longimanus) is an important top predator in pelagic ecosystems currently classified as globally Critically Endangered by the International Union for the Conservation of Nature. This species is incidentally caught by fisheries targeting highly migratory tunas and billfishes throughout the Indian Ocean. Understand...
Article
Full-text available
Significance Humans are exposed to toxic methylmercury mainly by consuming marine fish. New environmental policies under the Minamata Convention rely on a yet-poorly-known understanding of how mercury emissions translate into fish methylmercury levels. Here, we provide the first detailed map of mercury concentrations from skipjack tuna across the P...
Conference Paper
Full-text available
This document is a review of methods to determine prey consumption rates, gastric evacuation and daily ration of pelagic fishes, and serves as a precursor to estimating the consumption/biomass ratio (Q/B) for key predators in the tuna fisheries of the eastern Pacific Ocean. Q/B is an essential component of ecosystem models.
Article
Full-text available
Tuna fisheries are among the largest and most valuable fisheries in the world, but most interact with many non-target species, including several of high conservation importance. The spinetail devil ray (Mobula mobular) – listed as ‘Endangered’ on the IUCN Red List of Threatened Species – is a commonly discarded bycatch species, particularly in the...
Article
arising from n. Queiroz et al. Nature https://doi. Many shark species worldwide are vulnerable to overexploitation due to fishing. Using only the horizontal spatial overlap between the space use of 23 satellite-tracked shark species and the fishing distribution of pelagic longline fisheries tracked using an automatic identification system, Queiroz...
Conference Paper
Full-text available
Over the past 3 years, the IATTC staff have worked together with CPCs to incrementally refine the data reporting requirements for large-scale tuna longline fishing vessels (LSTLFVs) to enable IATTC scientific staff to enhance the reporting of non-target species (i.e. “bycatch”) for the Ecosystem Considerations report and the Fishery Status Report....
Conference Paper
Full-text available
The Inter-American Tropical Tuna Commission (IATTC) has annually reported on 7 ecological indicators derived from the “ETP7” ecosystem model since 2019 as one of several strategies to facilitate an ecosystem approach to the management of tuna fisheries in the eastern Pacific Ocean (EPO) as mandated by the Antigua Convention. Reporting of bycatch in...
Article
Full-text available
The eastern Pacific Ocean (EPO) covers ~ 55 million km2 of complex, dynamic habitats that can affect the distribution of ecologically and commercially important skipjack tuna, Katsuwonus pelamis, and its forage. The relationships between oceanography, ontogeny, and forage were quantitatively assessed to better understand skipjack tuna trophic ecolo...
Conference Paper
Full-text available
Industrial and small-scale coastal (i.e., ‘artisanal’) pelagic fisheries in the eastern Pacific Ocean (EPO) interact with one of the most vulnerable fishery bycatch species, the East Pacific (EP) stock of leatherback turtle (Dermochelys coriacea). As a result of the species’ longevity, slow growth, low reproductive output, and critically low popula...
Article
Full-text available
An ecological risk assessment was undertaken using productivity‐susceptibility analysis (PSA) to determine the relative vulnerability of 52 species caught by fisheries in the waters off eastern Taiwan. Overall, eight and 20 species were classified as having high and moderate vulnerability, respectively, and the remaining 24 species were classified...
Article
Full-text available
Ecological risk assessment (ERA), including Productivity-Susceptibility Analysis (PSA), is becoming increasingly used to assess the relative vulnerability of data-limited non-target species to the impacts by fishing. PSA was developed for the eastern Pacific Ocean (EPO) tuna purse-seine fishery to assess the vulnerability of incidentally-caught spe...
Article
Full-text available
The annual global catch of longtail tuna (Thunnus tonggol) has almost tripled in the past 20 years. In the Indian Ocean tuna fishery, longtail tuna catches now exceed those of some principle target species (e.g. bigeye and albacore tuna), resulting in numerous stock assessments concluding the species has been subject to overfishing and overfished f...
Article
Full-text available
Productivity-susceptibility analysis (PSA) is a widely used data-limited method to assess the relative vulnerability of species impacted by fisheries. Despite its widespread use, few authors have evaluated the impacts of attribute weightings and correlation of productivity attributes that may bias species' vulnerability scores. We evaluated the PSA...
Technical Report
Full-text available
Gaps in information on sport fishing catches of IOTC species have long been an issue affecting comprehensive data collection in the Indian Ocean. Some countries such as Mauritius and Kenya have reported sport fishing data periodically to the IOTC Secretariat in the past, while for others, no data has been reported, data may be misreported or catche...
Conference Paper
The eastern Pacific Ocean (EPO) large-scale tuna longline fishery represents an important component of the fishery for tunas and tuna-like species in the Pacific Ocean. Longlines are a passive gear, which means less control over interactions with non-target species, resulting in potentially greater ecological impacts than more selective or active g...
Conference Paper
Assessing ecological sustainability in fisheries has become increasingly important with the widespread adoption of the principles of ecosystem-based fisheries management (EBFM) and a growing requirement for some types of fishery certifications and ecolabeling. However, demonstrating ecological sustainability quantitatively is a significant challeng...
Conference Paper
Full-text available
The eastern Pacific Ocean (EPO) supports some of the largest and most valuable tuna fisheries in the world, accounting for 1.17 million (16%) of the global catch of 7.39 million metric tons of tuna and tuna-like species reported in 2015 (FAO 2017). Such large removals of biomass of these target species and their associated bycatch species of billfi...
Article
Morphometric relationships (length–weight and fork length–total length) were estimated for four scombrid species (Thunnus tonggol, Euthynnus affinis, Cybiosarda elegans, and Rastrelliger kanagurta) that are of growing importance to fisheries, but are also important predators representing different trophic levels in the neritic regime of Australian...
Article
Recreational fishing is a popular sport and leisure activity in many countries worldwide. There has been growing interest by recreational fishing groups and researchers in the perceived physical and psychological health and social (or ‘biopsychosocial’) benefits of recreational fishing. However, quantifying the key subjective ‘human dimensions’ of...
Technical Report
Full-text available
The Ecosciences Precinct (ESP) is a Queensland Government initiative to provide southeastern Queensland with a centralised collaboration hub for ecological research, management and policy agencies from state government, CSIRO, and local universities. ESP was first occupied in October 2010 by staff being relocated from various sites across southeast...
Article
A stock assessment incorporating sensitivity in biological parameters and potential fishery management strategies for wahoo (Acanthocybium solandri) in the southwest Pacific Ocean was undertaken to assess the stock status of this species for 2008–2010. Selectivity probabilities at age were similar for 2 commercial longline fisheries and a recreatio...
Article
Understanding the impacts of recreational fishing on commercially fished stocks is becoming increasingly relevant for fisheries managers. However, data from recreational fisheries are not commonly included in stock assessments of commercially fished stocks. Simulation models of two assessment methods employed in Australia's Commonwealth fisheries w...
Technical Report
Full-text available
1. The purpose of this report is to provide Pacific Island countries that are influenced by the warm pool (the area bounded by 10°N–15°S and 140°E–180°) with information on the potential impacts of tuna fishing on this important pelagic ecosystem, with a view to assisting these countries with developing policies that minimise the detrimental impact...
Article
Sailfish (Istiophorus platypterus) is an important apex predator in neritic and oceanic pelagic ecosystems. The species is also a primary target of important catch-and-release sport fisheries that the support local economies of developing countries. However, commercial purse-seine fisheries that target tuna in the Eastern Pacific Ocean (EPO) incide...
Technical Report
Full-text available
Recreational fishing is a popular sport and social activity in Australia with over 3.3 million participants catching 72 million finfish and contributing $1.8 billion to the economy annually in 2000/01. Since this time, there has been little coordinated research on recreational fishing and relatively little research funding. In recent years however,...
Article
Full-text available
Partial migration is considered ubiquitous among vertebrates, but little is known about the movements of oceanodromous apex predators such as sharks, particularly at their range extents. PAT-Mk10 and SPOT5 electronic tags were used to investigate tiger shark (Galeocerdo cuvier) spatial dynamics, site fidelity and habitat use off eastern Australia b...
Chapter
Full-text available
In this ecological risk assessment for the Flinders and Gilbert river catchment, available catch and effort data were collated for commercial, recreational and Indigenous fisheries as well as fishery independent aquatic faunal and trophic surveys in the southeastern GoC. This identified 46 taxonomic groups that were considered by scientific experts...
Book
Full-text available
OUTCOMES • An improved understanding of the available datasets, and data deficiencies, relating to recreational fishing in Australia through the successful collaboration of researchers, fishery managers and recreational fishing groups. • Identification and prioritisation of recreationally-important species at the national level. • A quantitative...
Chapter
Full-text available
Fisheries that target predatory species occupying high trophic levels have been shown to have negative impacts on not only the target species, but the structure and functionality of the supporting ecosystem (Pauly et al., 1998; Cox et al., 2002; Polovina et al., 2009). For example, in a subtropical Pacific ecosystem, Polovina et al. (2009) showed t...
Article
‘Wasp-waist’ control of marine ecosystems is driven by a combination of top-down and bottom-up forcing by a few abundant short-lived species occupying intermediate trophic levels that form a narrow ‘waist’ through which energy flow from low to high trophic levels is controlled. It has been assumed that wasp-waist control occurs primarily in highly...
Article
A dearth of basic biological information for wahoo, Acanthocybium solandri, currently hinders the ability of scientists and managers to assess population sustainability and appropriately manage the dramatically increasing global catch. This study examined the gonads of 382 wahoo collected off eastern Australia during 2008–2011 to quantify their rep...
Article
Zischke, M. T., Griffiths, S. P., and Tibbetts, I. R. 2013. Rapid growth of wahoo (Acanthocybium solandri) in the Coral Sea, based on length-at-age estimates using annual and daily increments on sagittal otoliths. – ICES Journal of Marine Science, 70: 1128–1139. The wahoo (Acanthocybium solandri) is an economically important species incidentally ca...
Article
Spatial management is used extensively in natural resource management to address sustainability and biodiversity issues, for example through declaration of terrestrial National Parks and marine protected areas (MPAs).Spatial management is used also to optimize yields or protect key parts of the life cycle of species that are utilized (hunted, farme...
Article
Full-text available
Climate change presents an emerging challenge to the sustainable management of tuna fisheries, and robust information is essential to ensure future sustainability. Climate and harvest affect tuna stocks, populations of non-target, dependent species and the ecosystem. To provide relevant advice we need an improved understanding of oceanic ecosystems...
Article
Full-text available
Pacific Island countries have an extraordinary dependence on fisheries and aquaculture. Maintaining the benefits from the sector is a difficult task, now made more complex by climate change. Here we report how changes to the atmosphere-ocean are likely to affect the food webs, habitats and stocks underpinning fisheries and aquaculture across the re...
Article
The ecological effect of prawn trawling on the benthos of the Gulf of Carpentaria, northern Australia, was investigated by examining stomach contents of common demersal fishes incidentally caught as by-catch in the fishery. Fishes were collected from high and low fishing intensity sites in three regions based on vessel monitoring system data. The d...
Article
Zischke, M. T., Griffiths, S. P., Tibbetts, I. R., and Lester, R. J. G. 2013. Stock identification of wahoo (Acanthocybium solandri) in the Pacific and Indian Oceans using morphometrics and parasites. – ICES Journal of Marine Science, 70:164–172. The wahoo (Acanthocybium solandri) is an increasingly important by-product species of tropical pelagic...
Article
A specialised recreational land-based game fish fishery in south-eastern Australia was characterised using electronic fisher diaries. Live bait and lure-casting were the primary methods used during long trip durations (mean 9.44 ± SD 6.65 h). Effort was temporally and spatially dynamic, whereby fishers appeared to follow the 20 °C sea surface tempe...
Article
Recreational fisheries are undergoing increasing participation, specialisation and fishing power and contribute significantly to the total catch of several species. The specialised recreational pelagic sport fishery off eastern Australia was studied using a 12-month daytime access point survey. Sport fishing comprised 15% of the fishing trips of th...
Article
Advances in fishing technologies have increased the efficiency and diversification of recreational fisheries. This poses challenges for surveying specialised or ‘hard-to-reach’ recreational fishers (e.g. sport fishers) that may take the majority of the recreational catch for some species, but are too rare within the general population to be sampled...
Conference Paper
Recreational fishing is a popular sport and social activity undertaken by an estimated 11.5% of the global population, who catch an estimated 47 billion fish annually. Increasing availability, affordability and improvements of boats, searching technologies (e.g. GPS, sonar) and fishing tackle (e.g. electric reels), have resulted in increased effici...
Article
Managing the sustainability of bycatch species is important for many fisheries worldwide. However, high survey costs, rarity of vulnerable bycatch species, and widespread use of bycatch reduction devices, increase the difficulty of assessing sustainability. We developed a sample size estimation framework using zero-inflated count models that incorp...
Article
The reproductive biology of 315 cobia, Rachycentron canadum, from northeastern Australia was studied for an 18-month period. Cobia ranged from 181 to 1,470 mm FL (0.06–55 kg). Length–frequency distributions of males and females did not differ significantly. The sex ratio of females to males was 2.18:1. Histological data showed that cobia developed...
Book
Full-text available
A global literature review of recreational fishing survey methods determined potential cost-effective methods for monitoring recreational fishing in Commonwealth fisheries. National stakeholder workshops facilitated exchange of current knowledge of recreational fishing survey methodologies between state and Commonwealth government agencies and no...
Article
Abstract Small and juvenile fish from three intermittently open estuaries in south-eastern Australia were sampled with a seine net to investigate species richness and the effect of estuary openings on assemblages. A total of 7285 fish were captured, representing 29 species. The most numerous fish were hardyhead, Atherinosoma microstoma Günther, fla...
Book
Full-text available
Available information and knowledge gaps on the biology, ecology and fisheries for longtail tuna, Thunnus tonggol (Bleeker 1851), were identified in order to assess the status of this ‘recreational-only’ species in Australia. Specialist sport fishers who catch longtail tuna can be considered a ‘hard-to-reach’ population, which cannot be cost-effe...
Article
Abstract  Age and growth of Rachycentron canadum (L.) was studied in northern and eastern Australia to provide data for a preliminary assessment of the stock and to explore possible fisheries management strategies using minimum legal lengths. Fish collected from commercial and recreational fisheries ranged in size and weight from 125 to 1633 mm for...
Article
Full-text available
Expert knowledge in ecology is gaining momentum as a tool for conservation decision-making where data are lacking. Yet, little information is available to help a researcher decide whether expert opinion is useful for their model, how an elicitation should be conducted, what the most relevant method for elicitation is and how this can be translated...
Article
Full-text available
Pelagic longline fisheries target (or catch incidently) large apex predators in the open ocean (e.g. tunas, billfish and sharks) and have the potential to disrupt the ecosystem functionality if these predators exert strong top–down control. In contrast, warming of oceans from climate change may increase bottom–up effects from increases in primary p...
Article
Obtaining reliable estimates of important parameters from recreational fisheries is problematic but critical for stock assessment and effective resource management. Sampling methodologies based on traditional design-based sampling theory, is inadequate in obtaining representative catch and effort data, social or demographical characterization, or f...
Article
As part of a study of the reasons for declining commercial banana prawn catches in the Weipa area of the Gulf of Carpentaria, and in order to assess whether changes in predator numbers may be a factor influencing prawn numbers, the species composition, numbers and biomasses of fishes in the Embley estuary were re-examined in February 2005 for compa...