An assessment of the angling fishery for yellowfin bream, <i>Acanthopagrus australis</i> (Günther), in Moreton Bay, Australia

Pollock, B. R.; Williams, Meryl J.

doi:10.1111/j.1095-8649.1983.tb04732.x

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…We were unable to source records directly from local fishing clubs for this study, but previous studies have evaluated catch rate trends in wider southeast Queensland from fishing club data. Pollock and Williams [ 13 , 32 ] assessed fishing club data over 35 years (1945–1980) for surf fisheries in Moreton Bay, approximately 80 km south of our study area. These data were of sufficient resolution to depict seasonal trends, as well as species-specific trends in catch rate.…”

Section: Discussionmentioning

confidence: 99%

Popular media records reveal multi-decadal trends in recreational fishing catch rates

2017

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Despite threats to human wellbeing from ecological degradation, public engagement with this issue remains at low levels. However, studies have shown that crafting messages to resonate with people’s personal experiences can enhance engagement. Recreational fishing is one of the principal ways in which people interact with aquatic environments, but long-term data from this perspective are considered rare. We uncovered 852 popular media records of recreational fishing for an Australian estuary across a 140-year period. Using information contained in these articles we analysed the species composition of recreational catches over time and constructed two distinct time series of catch and effort (n fish fisher-1 trip-1; kg fish fisher-1 trip-1) for recreational fishing trips and fishing club competitions (mean n and kg fish caught across all competitors, and n and kg fish caught by the competition winner). Reported species composition remained similar over time. Catch rates reported from recreational fishing trips (1900–1998) displayed a significant decline, averaging 32.5 fish fisher-1 trip-1 prior to 1960, and 18.8 fish fisher-1 trip-1 post-1960. Mean n fish fisher-1 competition-1 (1913–1983) also significantly declined, but best n fish fisher-1 competition-1 (1925–1980) displayed no significant change, averaging 31.2 fish fisher-1 competition-1 over the time series. Mean and best kg fish fisher-1 competition-1 trends also displayed no significant change, averaging 4.2 and 9.9 kg fisher-1 competition-1, respectively. These variable trends suggest that while some fishers experienced diminishing returns in this region over the last few decades, the most skilled inshore fishers were able to maintain their catch rates, highlighting the difficulties inherent in crafting conservation messages that will resonate with all sections of a community. Despite these challenges, this research demonstrates that popular media sources can provide multiple long-term trends at spatial scales, in units and via a recreational experience that many people can relate to.

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Section: Discussionmentioning

confidence: 99%

Popular media records reveal multi-decadal trends in recreational fishing catch rates

2017

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“…Given the increasing pressures on tropical estuarine fisheries (Hatcher et a/., 1989) and the abundance of this species, it seems inevitable that A. herda will be targeted by commercial fishers at some time in the future. A congeneric sparid A. australis (Owen), that is already an important recreational angling species in temperate Australia (Pollock & Williams, 1983), has been recognized as a Protandrous hermaphrodite (Pollock, 1985). As yet, the reproductive pattern of A. berda has not been established.…”

Section: Introductionmentioning

confidence: 99%

Evidence of protandrous hermaphroditism in the tropical sparid Acanthopagrus berda

Tobin

Sheaves

Molony

1997

Journal of Fish Biology

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Evidence of protandrous sex change in Acanthopagrus berda is presented. An in‐field technique involving the recapture of fish whose sex had previously been determined allowed the detection of male to female sex change in A. berda (n=4). Sex change was also observed in fish held in an aquarium environment (n=4). Each fish was sexed as male at the time of their initial capture as determined by the extrusion of semen from the urogenital pores upon milking of the abdominal cavity. The technique of sexing fish in the field was validated. Macroscopic examination of the gonads of the fish that had changed sex showed each fish possessed a functional female ovotestis. Length‐frequency analysis conducted on two large samples showed clear length separation of the sexes supporting protandrous sex change. Macroscopic and microscopic observations of the gonad of A. berda showed a typical sparid ovotestis is represented in all fish with both male and female sexual tissues clearly present within the gonad.

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“…In addition non-migratory fish continue to feed during the early spawning period, whereas migratory fish do not feed in the spawning areas. It is interesting that spawning yellowfin bream at surf-bars in Moreton Bay are the subject of large angling fisheries (Pollock and Williams, 1983). These fish are capable of feeding because they are captured in large numbers on baited lines by anglers.…”

Section: Discussionmentioning

confidence: 99%

Relations between migration, reproduction and nutrition in yellowfin bream Acanthopagrus australis

Pollock¹

1984

Mar. Ecol. Prog. Ser.

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The yellowfin bream Acanthopagrus australis (Giinther) is an estuarine species in which a large proportion of the adult population does not participate in the annual seaward spawning migration. Monthly samples of migratory and non-migratory yellowfin bream were collected from March to October 1982. Measures of gonad and oocyte development and 3 indices of nutritional state (feeding index, visceral fat index and condition factor) were obtained for each fish sampled. Gonads developed to a similar size in migratory and non-migratory adults. Successful reproduction, as indicated by the presence of hyaline-stage oocytes, only occurred in migratory fish. In non-migratory females oocytes developed to the yolk-stage, but then became atretic and were resorbed. In both groups stored energy reserves decreased as the gonads increased in size; however the rate of decrease was greater in migratory fish. Feeding almost ceased in migratory fish during the spawning period (May to Aug) because suitable food items (benthic animals and plants) are uncommon in the spawning areas. In non-migratory fish, feeding was reduced during the late spawning period, possibly because abundant energy reserves were available due to oocyte resorption. An examination of sex ratios within age classes indicated a decreasing tendency of females to participate in the spawning migration with age. All male fish older than age I1 participate in the spawning migration. The seasonal patterns of gonad development and nutritional state associated with the spawning migration of yellowfin bream are similar to those reported for other teleost fishes. These patterns have not been documented for the non-migratory component of other teleosts which have annual spawning migrations.

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An assessment of the angling fishery for yellowfin bream, Acanthopagrus australis (Günther), in Moreton Bay, Australia

Cited by 6 publications

References 11 publications

Popular media records reveal multi-decadal trends in recreational fishing catch rates

Popular media records reveal multi-decadal trends in recreational fishing catch rates

Evidence of protandrous hermaphroditism in the tropical sparid Acanthopagrus berda

Relations between migration, reproduction and nutrition in yellowfin bream Acanthopagrus australis

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