Using a biophysical model to investigate connectivity between spawning grounds and nursery areas of King George whiting (<i>Sillaginodes punctatus</i>: Perciformes) in South Australia’s gulfs

Rogers, Troy A.; Rodriguez, Ana Redondo; Fowler, Anthony J.; Doubell, Mark; Drew, Michael; Steer, M. A.; Matthews, Damian J.; James, Charles; Gillanders, Bronwyn M.

doi:10.1111/fog.12502

Cited by 6 publications

(5 citation statements)

References 63 publications

(173 reference statements)

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“…An alternate approach is to simulate dispersal using biophysical models (Swearer et al 2019). The biological component of these models describes the ontogenetic development of the larvae, which can be retrospectively determined from the otolith microstructure of settled juveniles (i.e., spawn date, growth rate, settlement date) (Rogers et al 2021;Vaz et al 2019). Furthermore, the simulated patterns of larval dispersal can be compared to the relationships identified from otolith biomarkers to assess model predictions and best interpret connectivity.…”

Section: Natal Origin and Estuarine And Coastal Nursery Contributionsmentioning

confidence: 99%

Reading the biomineralized book of life: expanding otolith biogeochemical research and applications for fisheries and ecosystem-based management

Patrick

Gillanders

Sturrock

et al. 2022

Rev Fish Biol Fisheries

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Chemical analysis of calcified structures continues to flourish, as analytical and technological advances enable researchers to tap into trace elements and isotopes taken up in otoliths and other archival tissues at ever greater resolution. Increasingly, these tracers are applied to refine age estimation and interpretation, and to chronicle responses to environmental stressors, linking these to ecological, physiological, and life-history processes. Here, we review emerging approaches and innovative research directions in otolith chemistry, as well as in the chemistry of other archival tissues, outlining their value for fisheries and ecosystem-based management, turning the spotlight on areas where such biomarkers can support decision making. We summarise recent milestones and the challenges that lie ahead to using otoliths and archival tissues as biomarkers, grouped into seven, rapidly expanding and application-oriented research areas that apply chemical analysis in a variety of contexts, namely: (1) supporting fish age estimation; (2) evaluating environmental stress, ecophysiology and individual performance; (3) confirming seafood provenance; (4) resolving connectivity and movement pathways; (5) characterising food webs and trophic interactions; (6) reconstructing reproductive life histories; and (7) tracing stock enhancement efforts. Emerging research directions that apply hard part chemistry to combat seafood fraud, quantify past food webs, as well as to reconcile growth, movement, thermal, metabolic, stress and reproductive life-histories provide opportunities to examine how harvesting and global change impact fish health and fisheries productivity. Ultimately, improved appreciation of the many practical benefits of archival tissue chemistry to fisheries and ecosystem-based management will support their increased implementation into routine monitoring. Graphical abstract

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Section: Natal Origin and Estuarine And Coastal Nursery Contributionsmentioning

confidence: 99%

Reading the biomineralized book of life: expanding otolith biogeochemical research and applications for fisheries and ecosystem-based management

Patrick

Gillanders

Sturrock

et al. 2022

Rev Fish Biol Fisheries

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“…Given interannual variability in the strength of recruitment for some of the key harvested species in South Australia (e.g. King George whiting; Rogers et al., 2021), and the influence of inter‐annual weather patterns such as El Niño Southern Oscillation events (noting that 2022–2023 was a La Niña period), ongoing monitoring at this location will be especially important to ensure that our low estimate of biomass enhancement is not misleading. Other possible explanations for low juvenile fish abundance at the Glenelg reef are (1) differences in the physical properties of the systems, with Glenelg located in an open‐water gulf while Dromana and Margaret are situated in a semi‐enclosed protected bay and (2) a greater extent of alternative structured habitat such as seagrass in Gulf St. Vincent, compared to the patchy and much reduced extent of seagrass historically in Port Phillip Bay (Connolly et al., 2018), further supporting the above statement that the production at Glenelg may not be habitat limited and is instead subject to other bottlenecks, such as reduced egg supply.…”

Section: Discussionmentioning

confidence: 99%

“…(e.g. King George whiting;Rogers et al, 2021), and the influence of inter-annual weather patterns such as El Niño Southern Oscillation events (noting that 2022-2023 was a La Niña period), ongoing monitoring at this location will be especially important to ensure that our low estimate of biomass enhancement is not misleading. Other possible explanations for low juvenile fish abundance at the Glenelg reef are (1) differences in the physical properties of the systems, with Glenelg located in an open-water gulf while Dromana and Margaret are situated in a semi-enclosed protected bay and (2) a greater extent of alternative structured habitat such as seagrass in Gulf St.…”

mentioning

confidence: 99%

Estimating enhanced fish production on restored shellfish reefs using automated data collection from underwater videos

Connolly,

Herrera,

Rasmussen

et al. 2024

Journal of Applied Ecology

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Shellfish reefs across the world have been heavily degraded by mechanical harvesting, disease and declining water quality. In southern Australia, where substantial losses have occurred, government and non‐government efforts to restore functioning reefs are now underway with a strong focus on enhancing fish productivity. However, the capacity of these restored reefs to enhance fish production remains unknown, hampering estimates of return on investment. We quantify the density differences of newly recruited juvenile fish and other nekton on these restored reefs, relative to those on unrestored, unstructured habitat. Fish were surveyed at three paired reef‐unstructured locations using 169 unbaited stereo video deployments during three periods over 12 months (2022–2023). We used automation software, FishID, to automatically identify, size and count fish in videos. We subsequently applied known growth and mortality parameters to model enhancement of fish productivity. Sixteen species occurred as new recruits, with all but two found at higher densities on reefs than unstructured habitat. Enhancement of fish production from subtidal restored shellfish reefs from a single year's cohort is estimated to be, on average, 6186 kg ha−1 year−1 (SD 1802) after enough time has elapsed for all species to have matured. Species harvested commercially or recreationally contributed 98% of that production (6083 kg ha−1 year−1, SD 1797). Enhancement varied greatly among locations, ranging from 12,738 kg ha−1 year−1 (SD 2894), which is the highest yet recorded anywhere, to 1.4 kg ha−1 year−1 (SD 0.9). The lack of juvenile fish at the location with the lowest estimated enhancement might be explained by the impact of overfishing on recruitment of key species or by an abundance of alternative habitat for juvenile fish. Synthesis and applications. The combination of underwater videos with automated data extraction provides a reliable, cost‐effective method for surveying fish on oyster reefs. By quantifying enhanced fish productivity on reefs, we provide estimates that will underpin calculations of ecological, social and financial benefits, supporting the business case for scaling‐up restoration efforts.

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“…Therefore, even with A. butcheri estuary‐hopping to adjacent locations, long distance movement would be required for fish to migrate between both South Australian gulfs. Additional sampling along the coastline between Tumby Bay and Gulf St Vincent may be needed to provide greater insight into their connectivity and gene flow associated with regional oceanographic conditions and predicted residual currents between both South Australian gulfs (Rogers et al., 2021 ).…”

Section: Discussionmentioning

confidence: 99%

Strong philopatry in an estuarine‐dependent fish

Sarakinis,

Reis‐Santos,

Donnellan

et al. 2024

Ecology and Evolution

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Understanding fish movement is critical in determining the spatial scales in which to appropriately manage wild populations. Genetic markers provide a natural tagging approach to assess the degree of gene flow and population connectivity across a species distribution. We investigated the genetic structure of black bream Acanthopagrus butcheri across its entire distribution range in Australia, as well as regional scale gene flow across south‐eastern Australia by undertaking a comprehensive analysis of the populations in estuaries across the region. We applied genome‐wide sampling of single‐nucleotide polymorphism (SNP) markers generated from restriction site‐associated DNA sequencing. Genetic structure and potential gene flow was assessed using principal component analyses and admixture analyses (STRUCTURE). Using 33,493 SNPs, we detected broad scale genetic structuring, with limited gene flow among regional clusters (i.e. Western Australia, South Australia and western Victoria; and eastern Victoria, Tasmania and New South Wales). This is likely the result of unsuitable habitats, strong ocean currents (e.g. the Leeuwin Current and the East Australian Current), large water bodies (e.g. Bass Strait) and known biogeographical provinces across the continent. Local‐scale genetic structuring was also identified across the south‐eastern Australian estuaries sampled, reflecting that the coexistence of both migratory and resident individuals within populations (i.e. partial migration), and the movement of fish into coastal waters, still results in strong philopatry across the region. Instances of movement among estuaries at this spatial scale were primarily found between adjacent estuaries and were likely attributed to lone migrants utilising inshore coastal currents for movement beyond nearby habitats. Targeting SNP markers in A. butcheri at this continental scale highlighted how neither spatial proximity of estuaries nor black bream's ability to move into coastal waters reflects increased gene flow. Overall, our findings highlight the importance of location‐specific management.

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Using a biophysical model to investigate connectivity between spawning grounds and nursery areas of King George whiting (Sillaginodes punctatus: Perciformes) in South Australia’s gulfs

Cited by 6 publications

References 63 publications

Reading the biomineralized book of life: expanding otolith biogeochemical research and applications for fisheries and ecosystem-based management

Reading the biomineralized book of life: expanding otolith biogeochemical research and applications for fisheries and ecosystem-based management

Estimating enhanced fish production on restored shellfish reefs using automated data collection from underwater videos

Strong philopatry in an estuarine‐dependent fish

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