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  1. Article: Life-history characteristics of the eastern shovelnose ray, Aptychotrema rostrata (Shaw, 1794), from southern Queensland, Australia

    Campbell, Matthew J. / McLennan, Mark F. / Courtney, Anthony J. / Simpfendorfer, Colin A.

    Marine & freshwater research. 2021, v. 72, no. 9

    2021  

    Abstract: The eastern shovelnose ray (Aptychotrema rostrata) is a medium-sized coastal batoid endemic to the eastern coast of Australia. It is the most common elasmobranch incidentally caught in the Queensland east coast otter trawl fishery, Australia’s largest ... ...

    Abstract The eastern shovelnose ray (Aptychotrema rostrata) is a medium-sized coastal batoid endemic to the eastern coast of Australia. It is the most common elasmobranch incidentally caught in the Queensland east coast otter trawl fishery, Australia’s largest penaeid-trawl fishery. Despite this, age and growth studies on this species are lacking. The present study estimated the growth parameters and age-at-maturity for A. rostrata on the basis of sampling conducted in southern Queensland, Australia. This study showed that A. rostrata exhibits slow growth and late maturity, which are common life-history strategies among elasmobranchs. Length-at-age data were analysed within a Bayesian framework and the von Bertalanffy growth function (VBGF) best described these data. The growth parameters were estimated as L0=193mm TL, k=0.08 year-1 and L∞=924mm TL. Age-at-maturity was found to be 13.3 years and 10.0 years for females and males respectively. The under-sampling of larger, older individuals was overcome by using informative priors, reducing bias in the growth and maturity estimates. As such, the results can be used to derive estimates of natural mortality for this species.
    Keywords Bayesian theory ; Elasmobranchii ; coasts ; fisheries ; freshwater ; life history ; mortality ; research ; trawl nets ; Queensland
    Language English
    Size p. 1280-1289.
    Publishing place CSIRO Publishing
    Document type Article
    ZDB-ID 1283028-8
    ISSN 1323-1650
    ISSN 1323-1650
    DOI 10.1071/MF20347
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  2. Article: Quantitative Analysis of the Fishery-Independent Queensland Saucer Scallop (Ylistrum balloti) Trawl Survey

    French, Samara M. / Courtney, Anthony J. / Yang, Wen-Hsi

    Journal of shellfish research. 2021 Sept. 14, v. 40, no. 2

    2021  

    Abstract: The Queensland saucer scallop Ylistrum balloti fishery is a significant component of the Queensland East Coast Otter Trawl Fishery. In 1996, the saucer scallop stock collapsed, and by 2006, had partially recovered. In 2016, the stock again collapsed, ... ...

    Abstract The Queensland saucer scallop Ylistrum balloti fishery is a significant component of the Queensland East Coast Otter Trawl Fishery. In 1996, the saucer scallop stock collapsed, and by 2006, had partially recovered. In 2016, the stock again collapsed, when it was declared, and remains, overfished. In response to the collapses, fishery managers implemented an annual fishery-independent trawl survey of scallop abundance, although funding for the survey has been inconsistent. This study examined 8 y of discontinuous fishery-independent scallop trawl survey data (1997 to 2000, 2017 to 2020). A two-stage approach was introduced to firstly calibrate catch rates for differences between survey vessels for each year, and then derive adjusted mean densities (number ha–¹) for the 0+ and 1+ scallop age classes and total scallops, for each year and strata. Quasi-Poisson generalized linear models were used for both stages. Results showed that adjusted mean total scallop densities declined by approximately half from the early survey years (1997 to 2000) to the later survey years (2017 to 2020). Adjusted mean total scallop density and adjusted mean densities of the 0+ and 1+ age classes were lowest in 2020. The 1+ age class numerically dominated survey catch rates.
    Keywords coasts ; quantitative analysis ; research ; scallops ; shellfish ; surveys ; trawl nets ; Queensland
    Language English
    Dates of publication 2021-0914
    Size p. 297-309.
    Publishing place National Shellfisheries Association
    Document type Article
    ZDB-ID 22976-3
    ISSN 0730-8000 ; 0077-5711
    ISSN 0730-8000 ; 0077-5711
    DOI 10.2983/035.040.0208
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  3. Article: Estimating the natural mortality rate of saucer scallops (Ylistrum balloti) on the Queensland east coast from tag-recaptures

    Courtney, Anthony J. / Leigh, George M. / Yang, Wen-Hsi / Campbell, Matthew J. / McLennan, Mark F.

    Fisheries research. 2022 June, v. 250

    2022  

    Abstract: Saucer scallops (Ylistrum balloti) were tagged and released on four occasions inside two areas closed to fishing (Hervey Bay A, HBA; and Yeppoon B, YB) on the Queensland (Australia) east coast and their subsequent recaptures over the following months ... ...

    Abstract Saucer scallops (Ylistrum balloti) were tagged and released on four occasions inside two areas closed to fishing (Hervey Bay A, HBA; and Yeppoon B, YB) on the Queensland (Australia) east coast and their subsequent recaptures over the following months were used to measure the instantaneous rate of natural mortality (M). A total of 13,295 scallops were tagged and 526 recaptured over the 15 month-long experiment (May 2018 to August 2019). Three statistical approaches were applied to the experimental design and analysis of the tagging data, based on 1) the Brownie model, 2) a modified version of the Brownie model, and 3) a binomial logistic regression model of recaptures. Estimates of M based on the Brownie model were much higher for tagged scallops that were at liberty over summer months compared to those at liberty over the winter months, possibly indicating seasonal variation. The logistic model parameter estimates indicated the proportion of recaptures differed significantly with the lunar phase at recapture, scallop size class, the number of days the scallops were at liberty and the interaction between days-at-liberty and closure. All three approaches indicated M was higher in HBA compared to YB. Mean estimates of M for the whole fishery, derived by averaging estimates from both closures, ranged from a minimum of 1.461 year–¹ for the logistic model, to 1.501 year–¹ for the Brownie model, to 1.548 year–¹ (variable recapture rate) and 1.594 year–¹ (fixed recapture rate) for the modified Brownie model. Estimates from all three approaches were higher than the previous estimate that was published over 40 years ago and possible reasons for the increase are discussed.
    Keywords coasts ; experimental design ; fisheries ; logit analysis ; models ; mortality ; research ; scallops ; seasonal variation ; summer ; Queensland
    Language English
    Dates of publication 2022-06
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 406532-3
    ISSN 0165-7836
    ISSN 0165-7836
    DOI 10.1016/j.fishres.2022.106273
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  4. Article: Quantifying northward movement rates of eastern king prawns along eastern Australia

    Braccini, Matias / O’Neill, Michael F / Courtney, Anthony J / Leigh, George M / Campbell, Alex B / Montgomery, Steven S / Prosser, A. J

    Marine biology. 2012 Oct., v. 159, no. 10

    2012  

    Abstract: Movement rates of eastern king prawns, Melicertus plebejus (Hess), were estimated from historical and recent conventional tag-recapture information collected across eastern Australia. Data from three studies and 2,656 tag recaptures were used. Recaptured ...

    Abstract Movement rates of eastern king prawns, Melicertus plebejus (Hess), were estimated from historical and recent conventional tag-recapture information collected across eastern Australia. Data from three studies and 2,656 tag recaptures were used. Recaptured males and females both moved east–north-east in central Queensland and north–north-east in southern Queensland and New South Wales. Over a period of one year, the estimated transition matrix reflected the species strong northerly movement and the more complex longitudinal movement, showing a very high probability of eastern movement in central Queensland and almost negligible eastern or western movement in northern New South Wales. The high exchange probability between New South Wales and Queensland waters indicated that spatial assessment models with movement rates between state jurisdictions would improve the management of this single-unit stock.
    Keywords Melicertus plebejus ; females ; history ; males ; models ; probability ; New South Wales ; Queensland
    Language English
    Dates of publication 2012-10
    Size p. 2127-2136.
    Publishing place Springer-Verlag
    Document type Article
    ZDB-ID 1117-4
    ISSN 1432-1793 ; 0025-3162
    ISSN (online) 1432-1793
    ISSN 0025-3162
    DOI 10.1007/s00227-012-1999-1
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  5. Article: Round scallops and square meshes: a comparison of four codend types on the catch rates of target species and by-catch in the Queensland (Australia) saucer scallop (Amusium balloti) trawl fishery

    Courtney, Anthony J / Campbell, Matthew J / Roy, Darren P / Tonks, Mark L / Chilcott, Keith E / Kyne, Peter M

    Marine & freshwater research. 2008, v. 59, no. 10

    2008  

    Abstract: Concern over the amount of by-catch from benthic trawl fisheries and research into the problem have increased in recent years. The present paper demonstrated that by-catch rates in the Queensland (Australia) saucer scallop (Amusium balloti) trawl fishery ...

    Abstract Concern over the amount of by-catch from benthic trawl fisheries and research into the problem have increased in recent years. The present paper demonstrated that by-catch rates in the Queensland (Australia) saucer scallop (Amusium balloti) trawl fishery can be reduced by 77% (by weight) using nets fitted with a turtle excluder device (TED) and a square-mesh codend, compared with a standard diamond-mesh codend with no TED. This large reduction was achieved with no significant effect on the legal size scallop catch rate and 39% fewer undersize scallops were caught. In total, 382 taxa were recorded in the by-catch, which was dominated by sponges, portunid crabs, small demersal and benthic fish (e.g. leatherjackets, stingerfish, bearded ghouls, nemipterids, longspine emperors, lizard fish, triggerfish, flounders and rabbitfish), elasmobranchs (e.g. mainly rays) and invertebrates (e.g. sea stars, sea urchins, sea cucumbers and bivalve molluscs). Extremely high reductions in catch rate (i.e. greater-than-or-equal85%) were demonstrated for several by-catch species owing to the square-mesh codend. Square-mesh codends show potential as a means of greatly reducing by-catch and lowering the incidental capture and mortality of undersize scallops and Moreton Bay bugs (Thenus australiensis) in this fishery.
    Keywords drag ; Great Barrier Reef
    Language English
    Size p. 849-864.
    Publishing place Collingwood, Victoria: CSIRO Publishing
    Document type Article
    ZDB-ID 1283028-8
    ISSN 1323-1650
    ISSN 1323-1650
    DOI 10.1071/MF08073
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  6. Article: The genetic effective and adult census size of an Australian population of tiger prawns (Penaeus esculentus)

    OVENDEN, JENNIFER R / PEEL, DAVID / STREET, RAEWYN / COURTNEY, ANTHONY J / HOYLE, SIMON D / PEEL, SAMANTHA L / PODLICH, HEATHER

    Molecular ecology. 2007 Jan., v. 16, no. 1

    2007  

    Abstract: This study compares estimates of the census size of the spawning population with genetic estimates of effective current and long-term population size for an abundant and commercially important marine invertebrate, the brown tiger prawn (Penaeus ... ...

    Abstract This study compares estimates of the census size of the spawning population with genetic estimates of effective current and long-term population size for an abundant and commercially important marine invertebrate, the brown tiger prawn (Penaeus esculentus). Our aim was to focus on the relationship between genetic effective and census size that may provide a source of information for viability analyses of naturally occurring populations. Samples were taken in 2001, 2002 and 2003 from a population on the east coast of Australia and temporal allelic variation was measured at eight polymorphic microsatellite loci. Moments-based and maximum-likelihood estimates of current genetic effective population size ranged from 797 to 1304. The mean long-term genetic effective population size was 9968. Although small for a large population, the effective population size estimates were above the threshold where genetic diversity is lost at neutral alleles through drift or inbreeding. Simulation studies correctly predicted that under these experimental conditions the genetic estimates would have non-infinite upper confidence limits and revealed they might be overestimates of the true size. We also show that estimates of mortality and variance in family size may be derived from data on average fecundity, current genetic effective and census spawning population size, assuming effective population size is equivalent to the number of breeders. This work confirms that it is feasible to obtain accurate estimates of current genetic effective population size for abundant Type III species using existing genetic marker technology.
    Keywords Panthera tigris ; Penaeus esculentus ; alleles ; coasts ; family size ; fecundity ; genetic relationships ; genetic variation ; inbreeding ; information sources ; microsatellite repeats ; mortality ; population size ; shrimp ; spawning ; temporal variation ; variance ; viability ; Australia
    Language English
    Dates of publication 2007-01
    Size p. 127-138.
    Publisher Blackwell Publishing Ltd
    Publishing place Oxford, UK
    Document type Article
    ZDB-ID 1126687-9
    ISSN 1365-294X ; 0962-1083
    ISSN (online) 1365-294X
    ISSN 0962-1083
    DOI 10.1111/j.1365-294X.2006.03132.x
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  7. Article: The genetic effective and adult census size of an Australian population of tiger prawns (Penaeus esculentus).

    Ovenden, Jennifer R / Peel, David / Street, Raewyn / Courtney, Anthony J / Hoyle, Simon D / Peel, Samantha L / Podlich, Heather

    Molecular ecology

    2007  Volume 16, Issue 1, Page(s) 127–138

    Abstract: This study compares estimates of the census size of the spawning population with genetic estimates of effective current and long-term population size for an abundant and commercially important marine invertebrate, the brown tiger prawn (Penaeus ... ...

    Abstract This study compares estimates of the census size of the spawning population with genetic estimates of effective current and long-term population size for an abundant and commercially important marine invertebrate, the brown tiger prawn (Penaeus esculentus). Our aim was to focus on the relationship between genetic effective and census size that may provide a source of information for viability analyses of naturally occurring populations. Samples were taken in 2001, 2002 and 2003 from a population on the east coast of Australia and temporal allelic variation was measured at eight polymorphic microsatellite loci. Moments-based and maximum-likelihood estimates of current genetic effective population size ranged from 797 to 1304. The mean long-term genetic effective population size was 9968. Although small for a large population, the effective population size estimates were above the threshold where genetic diversity is lost at neutral alleles through drift or inbreeding. Simulation studies correctly predicted that under these experimental conditions the genetic estimates would have non-infinite upper confidence limits and revealed they might be overestimates of the true size. We also show that estimates of mortality and variance in family size may be derived from data on average fecundity, current genetic effective and census spawning population size, assuming effective population size is equivalent to the number of breeders. This work confirms that it is feasible to obtain accurate estimates of current genetic effective population size for abundant Type III species using existing genetic marker technology.
    MeSH term(s) Alleles ; Animals ; Australia ; Computer Simulation ; Fertility ; Genetic Markers ; Genetic Variation ; Penaeidae/anatomy & histology ; Penaeidae/genetics ; Penaeidae/physiology ; Population Density
    Chemical Substances Genetic Markers
    Language English
    Publishing date 2007-01
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1126687-9
    ISSN 1365-294X ; 0962-1083
    ISSN (online) 1365-294X
    ISSN 0962-1083
    DOI 10.1111/j.1365-294X.2006.03132.x
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