Paul A. Hamer

Paul A. Hamer
The Pacific Community | SPC · Fisheries Aquaculture and Marine Ecosystems (Oceanic Fisheries Programme)

PhD

About

80
Publications
20,733
Reads
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1,440
Citations
Citations since 2017
33 Research Items
682 Citations
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2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
Introduction
Paul Hamer works for the Pacific Community (SPC) based in Noumea. Paul is Principal Fisheries Scientist (Stock Assessment and Modelling). He oversees and supports a team of scientists who provide stock assessment and other fishery modelling and analytical services to the Western and Central Pacific Fisheries Commission (WCPFC), the Forum Fisheries Agency (FFA), and other sub-regional groups and SPC members.
Additional affiliations
January 1997 - January 2020
Victorian Fisheries Authority
Position
  • Researcher

Publications

Publications (80)
Technical Report
Full-text available
This analysis presents additional work in order to constrain the model grid employed for the 2021 south Pacific blue shark(BSH) stock assessment in the Western and Central Pacific Ocean.
Technical Report
Full-text available
In the Western and Central Pacific Ocean (WCPO), programmes of large-scale tagging experiments have been carried out on skipjack, yellowfin and bigeye tuna, to aid estimation of movement and mortality parameters through the stock assessment model MULTIFAN-CL. The integration of tagging data in this context includes critical assumptions about the pe...
Conference Paper
Full-text available
Growth is a key uncertainty in the skipjack stock assessment for the Western and Central Pacific Fisheries Commission (WCPFC) convention area. Three new growth curves were produced as possible alternatives for use in the 2022 WCPFC skipjack assessment. For the 2022 diagnostic case, growth is estimated internally within MULTIFAN-CL, largely informed...
Article
Full-text available
Achieving a sustainable socio-ecological future now requires large-scale environmental repair actioned across legislative borders. Yet, enabling large-scale conservation is complicated by policy-making processes that grapple with a disconnect between socio-economic interests and political priorities, multiple sources of knowledge, and differing app...
Technical Report
Full-text available
The tuna fisheries in the western and central Pacific Ocean (WCPO), encompassed by the Western and Central Pacific Fisheries Commission Convention Area (WCPFC-CA), are diverse, ranging from small-scale, artisanal operations in the coastal waters of Pacific states, to large-scale, industrial purse seine, pole-and-line and longline operations in the...
Article
The value of critical habitats, such as seagrass, to act as a nursery varies spatially and temporally; however, such information is essential for the public and stakeholders to appropriately value and manage these habitats. We use an existing systematic long-term fisheries dataset in Port Phillip Bay to examine variability in nursery habitat value...
Conference Paper
Full-text available
Drifting Fish Aggregating Devices (dFADs) are used in large numbers in the Western and Central Pacific Ocean (WCPO), and their potential impacts in a number of areas are of growing concern. This paper summarises the work from several dFAD-related projects, including: i) a regional database on beached and lost dFADs; ii) updated estimates on the num...
Conference Paper
Full-text available
This report presents a study, in partnership with fishing companies, satellite buoy providers, and funded by The Nature Conservancy (TNC), to identify and evaluate options for reducing drifting Fish Aggregating Devices (dFADs) loss, thereby reducing associated ecosystem impacts. The study investigates the spatial and temporal dynamics of dFAD use a...
Conference Paper
Full-text available
WCPFC Project 110 will conduct trials of non-entangling and biodegradable drifting Fish Aggregation Devices (dFADs) in the Western and Central Pacific Ocean (WCPO). It will provide essential information to the tuna fishing industry on the designs, types of materials, performance and cost-effectiveness of non-entangling and biodegradable dFADs in th...
Article
Full-text available
Drifting Fish Aggregating Devices (dFADs) are a major fishing mode for tropical tuna purse seine fisheries worldwide. However, the extent of dFAD use remains poorly understood. We present novel approaches for estimating annual dFAD deployments and number of dFADs monitored by individual vessels, using empirical data and robust estimation procedures...
Article
Full-text available
Spawning sources of King George whiting Sillaginodes punctatus populations in the states of South Australia and Victoria (south-eastern Australia) were analysed using otolith chemistry and microstructure from post-larvae sampled from 3 nursery areas in each state in the spring of 2011 and 2012. Univariate and multivariate analysis of the chemistry...
Technical Report
Full-text available
This report focuses on the primary tuna stocks targeted by the main WCPO industrial fisheries - skipjack (Katsuwonus pelamis), yellowfin (Thunnus albacares), bigeye (T. obesus) and South Pacific albacore tuna (T. alalunga). The report is divided into three parts: the first section provides an overview of the fishery, with emphasis on developments...
Technical Report
Victorian wrasse populations support mostly local port-based commercial fisheries. The Victorian fishery predominantly uses ‘hook & line’ to harvest wrasse from in-shore waters (<30m depth) year-round for the live fish restaurant market. There is also a small recreational fishery. This document summarises the performance of the Victorian ocean wras...
Conference Paper
Full-text available
The assessment of yellowfin tuna Thunnus albacares from the western and central Pacific Ocean (WCPO) relies heavily on fishery-dependent data to inform the assessment model on trends in biomass. The longline fishery, which primarily targets adult yellowfin provides key inputs to the assessment; however these data may be unreliable when it comes to...
Conference Paper
Full-text available
Developing a reliable index of relative abundance for skipjack, to inform the assessment model on trends through time, is a priority given the contraction of the pole-and-line fishery. Catch rates from the pole-and-line fishery have been a key input into the skipjack assessment models in the past, but the fishery’s ability to provide the spatial an...
Article
Full-text available
Planned adaptation to climate impacts and subsequent vulnerabilities will necessarily interact with autonomous responses enabled within existing fisheries management processes and initiated by the harvest and post-harvest components of fishing industries. Optimal adaptation options are those which enable negative effects to be mitigated and opportu...
Conference Paper
Full-text available
Article
Full-text available
We review the status of marine shellfish ecosystems formed primarily by bivalves in Australia, including: identifying ecosystem-forming species, assessing their historical and current extent, causes for decline and past and present management. Fourteen species of bivalves were identified as developing complex, three-dimensional reef or bed ecosyste...
Data
Published research articles and reports on Australian shellfish ecosystem-forming species. See Table 2 for category codes. (DOCX)
Article
We conducted a before-after-control-impact (BACI) experiment to evaluate the effects of deploying small-scale artificial patch reefs on fish assemblages in a temperate bay (Port Phillip Bay) in south-eastern Australia. Three replicate artificial reef treatments were placed on sandy substratum and the response of the fish assemblage was compared wit...
Technical Report
Full-text available
The Port Phillip Bay snapper fishery is highly valued by anglers, and is a major drawcard for recreational fishing in Victoria. The adult fishery is highly seasonal depending on migration of fish to and from the bay and coastal waters, and their aggregation in certain regions of the bay for spawning in spring-summer. The bay is also a juvenile nurs...
Article
Snapper, Chrysophrys auratus, is a highly important fishery resource of southern Australia. Through the late 2000s, the State of South Australia (SA) produced record commercial catches of this species, making the dominant contribution to the national catch. This was associated with dramatic changes in contributions from SA’s regional fisheries. The...
Technical Report
Full-text available
Executive Summary What the project achieved The first spatial mapping of Blue-eye Trevalla stocks in Australian waters was completed between 2013 and 2016 using a variety of techniques, novel approaches, leading edge technology, a synthesis of historical data, and input from knowledgeable commercial fishers. Each of our three primary analyses pr...
Technical Report
Full-text available
Fisheries Victoria conducts periodic assessments of the status of key fish species and the fisheries they support. These assessments compile relevant data from recreational fishery monitoring programs, commercial fishery catch and effort reporting where available, scientific surveys and other data such as age and length composition, to support a ‘w...
Article
Survival of larval fish is often linked to production of preferred prey such as copepods, both inter- and intra-annually. In turn, copepod production depends not only the quantity of food, but also on the nutritional quality, edibility and/or toxicity of their micro-algal food. Hence, larval fish survival can become de-coupled from levels of nutrie...
Technical Report
Full-text available
Fisheries Victoria conducts periodic assessments of the status of key fish species and the fisheries they support. The assessments compile relevant data from commercial fishery catch and effort reporting, recreational fishery monitoring programs, scientific surveys (such as juvenile pre-recruit surveys) and other data, such as age and length compos...
Technical Report
Full-text available
Overview This was a collaborative project amongst scientists from the University of Melbourne, Fisheries Victoria, Deakin University and the South Australian Research and Development Institute. The project led to major advances in our understanding of the biology and population structure of King George Whiting in southern Australia. The project wa...
Article
Victoria has lost vast areas (>95%) of native flat oyster (Ostrea angasi, Sowerby 1871) and blue mussel (Mytilus edulis galloprovinicialis, Lamarck 1819) reefs from estuarine and coastal waters since European settlement. We document the decline of these reefs by examining indigenous use of shellfish, the decimation of oyster reefs by dredge fishing...
Article
Full-text available
While arrow squid (Nototodarus gouldi) in Australia are currently managed as a single population, biological differences in individuals between locations of capture suggests these are separate stocks requiring stock-specific harvest strategies. We used two techniques to derive information about stock structure from different parts of the life cycle...
Article
Australians have a profound love for coastal and marine environments. Whilst iconic destinations such as the Great Barrier Reef, The Twelve Apostles and Rottnest Island annually attract millions of international visitors, Australians on weekends and over the summer holidays flock towards lesser-known, family destinations such as Lakes Entrance, Nam...
Article
Full-text available
Variation in strontium (Sr) and barium (Ba) within otoliths is invaluable to studies of fish diadromy. Typically, otolith Sr:Ca is positively related to salinity, and the ratios of Ba and Sr to calcium (Ca) vary in opposite directions in relation to salinity. In this study of jungle perch, Kuhlia rupestris, otolith Sr : Ca and Ba : Ca, however, sho...
Conference Paper
In fishes, the growth-mortality hypothesis has received broad acceptance as a driver of recruitment variability, with food-limitation and selective mortality resulting in the removal of slow-growing, small individuals from the population. Based on long-term monitoring in Port Phillip Bay, Australia, pink snapper, Chrysophrys auratus (Sparidae), exp...
Article
Full-text available
In fishes, the growth-mortality hypothesis has received broad acceptance as a driver of recruitment variability. Recruitment is likely to be lower in years when the risk of starvation and predation in the larval stage is greater, leading to higher mortality. Juvenile snapper, Pagrus auratus (Sparidae), experience high recruitment variation in Port...
Article
Full-text available
In 2006 the State Government of Victoria committed to conducting a trial of artificial (man-made) reefs to test their performance as a recreational fishery enhancement tool in Port Phillip Bay, and provide an assessment of their potential fishery management and broader ecological implications. The objectives of the trial were to: 1. Assess the im...
Article
Full-text available
There is a growing awareness of the impacts of fisheries on the marine ecosystem and the need for ecosystem-based fisheries management. Fisheries, particularly export fisheries, are increasingly being required to show that they are ecologically sustainable. A prime objective of the current management plan for the Victorian abalone fishery is to for...
Article
Full-text available
Fish have complex life cycles that contribute to interannual variability in recruitment. The growth-mortality hypothesis has received broad acceptance as a driver of recruitment variability, with cohorts comprised of fast-growing large-at-age larvae having high larval survival and subsequent juvenile recruitment. Long-term monitoring in Port Philli...
Article
The European sardine is one of the most important clupeoid fish captured by the Portuguese and Spanish purse-seine fleets in the Atlantic waters of the Iberian Peninsula. Despite the importance of this species, and substantial decrease in catches over the last two decades, knowledge about sardine movements and connectivity between their juvenile re...
Chapter
Full-text available
Climate change has already been linked to significant impacts on Earth's ocean ecosystems including shifts in species geographic ranges, changes in population abundance, shits in timing of seasonal events, and establishment of introduced species (Walter et al. 2002, Parmesan and Yohe 2003). Global climate modelling for the Australian region has ide...
Conference Paper
Arrow squid, Nototodarus gouldi, are managed as a single population in Australia; however, it is unknown whether N. gouldi caught in Victoria and the Great Australian Bight are from separate stocks. This study examines whether N. gouldi caught in these two spatially separated locations of southern Australia are different stocks. Fourier shape analy...
Article
Full-text available
Larval snapper (Chrysophrys auratus, Sparidae) sampled over 7 years had different diets and feeding strategies between years with lower versus higher larval and 0+ abundances. We analysed stomach contents of snapper larvae from each year to determine diet composition, prey selectivity, prey quality, and trophic niche breadth and compared larval die...
Article
Full-text available
Genetic variation (mtDNA) of the European conger eel, Conger conger, was compared across five locations in the north-eastern Atlantic (Madeira, Azores, South Portugal, North Portugal and Ireland) and one location in the western Mediterranean (Mallorca). Genetic diversity of conger eel was high, and differentiation among regions was not significant....
Article
The chemistry of black seabream Spondyliosoma cantharus otoliths from three main fishery grounds (Olhão, Sagres and Sesimbra) located along c. 400 km of the Portuguese south and west coasts was examined. Element:Ca ratios were determined in whole otoliths and otolith cores of young adult specimens of 2-3 years of age. Using the data from whole otol...
Article
This study investigated otolith shape, elemental chemistry of otolith cores (first 1–3 months of life), and stable isotope ratios (δ18O and δ13C) of whole otoliths as indicators of stock structure among three important southern Australian blue grenadier Macruronus novaezelandiae fishery regions; west Tasmania – WTAS, east Bass Strait – EBS, and Gre...
Article
Full-text available
The vertical distributions of marine fish larvae can change markedly over time due to changes in diel vertical migration (DVM). DVM is thought to be influenced by a number of factors including light levels and prey availability. In Port Phillip Bay, Australia, the DVM of snapper Chrysophrys auratus (Sparidae) larvae and their prey were investigated...
Article
Understanding geographic origins of fish is essential to the management of fisheries and protection of critical juvenile habitats. We used natural chemical tags (Mn, Sr, and Ba), characterized from otoliths of 0+ snapper (Pagrus auratus) (approximately 1–3 months postsettlement), to determine the origins of 1- and 2-year-old (subadult) fish about t...
Article
Ichthyoplankton sampling and otolith chemistry were used to determine the importance of transient spawning aggregations of snapper Chrysophrys auratus (Sparidae) in a large embayment, Port Phillip Bay (PPB), Australia, as a source of local and broad-scale fishery replenishment. Ichthyoplankton sampling across five spawning seasons within PPB, acros...
Technical Report
Full-text available
Sand flathead, Platycephalus bassensis, is important for recreational and commercial fishing in bays, inlets and coastal waters of southern mainland Australia and Tasmania. In Victoria, sand flathead are most important in Port Phillip Bay. Historically, the ability to reliably catch sand flathead in Port Phillip Bay has been an expectation of recre...
Technical Report
Full-text available