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John Stewart
New South Wales Department of Primary Industries
Spawn (biology)EcologyPopulationFisheryBiology
68Publications
13H-index
477Citations
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Publications 72
Newest
#1Hayden T. Schilling (UNSW: University of New South Wales)H-Index: 2
#2Jason D. Everett (UNSW: University of New South Wales)H-Index: 15
Last. Iain M. Suthers (UNSW: University of New South Wales)H-Index: 36
view all 8 authors...
Source
#1John StewartH-Index: 13
#2Julian M. HughesH-Index: 8
Last. Ashley M. FowlerH-Index: 14
view all 4 authors...
Abstract Freshwater flows into estuaries influence fish populations through effects on recruitment, growth and mortality. We compared year class strength of a large sciaenid Argyrosomus japonicus with rainfall through a 16-year period in southeastern Australia, to understand the influence of freshwater input on this estuary-dependent and depleted population. Relative year class strength, estimated by back-calculating age composition data from commercial fishery landings, was positively related t...
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Understanding the spatial ecology of exploited fish stocks is key to their sustainable management. Here we used a long-term cooperative tag and recapture dataset that encompassed the entire distribution of the stock to examine patterns of movement and growth of Chrysophrys auratus (Sparidae) along eastern Australia. More than 24000 individuals were tagged, with 2117 being recaptured with information suitable for analysis of movements and 1440 with information suitable for analysis of growth rate...
Source
#1Julian M. Hughes (New South Wales Department of Primary Industries)H-Index: 8
#2John Stewart (New South Wales Department of Primary Industries)H-Index: 13
Last. Damian Collins (New South Wales Department of Primary Industries)H-Index: 4
view all 3 authors...
A key factor affecting survival of fish captured from depth and subsequently released is barotrauma – a suite of injuries caused by expanding swim bladder gas and formation of gas embolisms resulting from the decreasing ambient pressure experienced during capture. Mulloway (Argyrosomus japonicus) are an economically-important fishery species in southern Australia often released from deep-water capture suffering from barotrauma. Hyperbaric chambers were therefore used to simulate various catch an...
Source
#1Hayden T. Schilling (UNSW: University of New South Wales)H-Index: 2
#2James A. Smith (UNSW: University of New South Wales)H-Index: 15
Last. Iain M. Suthers (UNSW: University of New South Wales)H-Index: 36
view all 6 authors...
Pomatomus saltatrix is an important recreational fishing species with seven major populations worldwide. The reproductive biology of the southwest Pacific Ocean (east Australian) population is uncertain, with both an extended spawning and multiple spawning periods previously hypothesised. Here we demonstrate an altered sex ratio biased towards females and a larger length at 50% maturity (L) compared to those recorded for the population 40 years ago, before comprehensive management strategies wer...
Source
#1Julian M. Hughes (New South Wales Department of Primary Industries)H-Index: 8
#2John Stewart (New South Wales Department of Primary Industries)H-Index: 13
Last. Damian Collins (New South Wales Department of Primary Industries)H-Index: 4
view all 3 authors...
Abstract A key factor affecting survival of fish which are captured at depth and subsequently released is barotrauma. Barotrauma are a suite of injuries which occur as a result of the decreasing ambient pressure experienced by a fish during capture and are caused by expanding swim bladder gas and formation of gas embolisms. Snapper (Chrysophrys auratus) are of key importance to both commercial and recreational fisheries in southern Australia and are often released after capture suffering from ba...
1 CitationsSource
#1Stuart C. Sexton (Flinders University)H-Index: 2
#2Tim M. Ward (South Australian Research and Development Institute)H-Index: 23
Last. Charlie Huveneers (Flinders University)H-Index: 20
view all 5 authors...
Previous studies have suggested that sardine, Sardinops sagax, off eastern Australia spawns across its entire range when habitat conditions are suitable. However, recent studies have suggested that separate sub‐populations and spawning groups may occur in the region. Spawning patterns off eastern Australia were investigated using data collected during nine ichthyoplankton surveys conducted between 1997–2015, and adult reproductive data obtained from ad hoc commercial sampling off New South Wales...
Source
#1Jess A. T. MorganH-Index: 28
#2Wayne SumptonH-Index: 11
Last. Jennifer R. Ovenden (UQ: University of Queensland)H-Index: 28
view all 7 authors...
Snapper Chrysophrys auratus is a high-value food fish in Australia targeted by both commercial and recreational fisheries. Along the east coast of Australia, fisheries are managed under four state jurisdictions (Queensland, Qld; New South Wales, NSW; Victoria, Vic.; and Tasmania, Tas.), each applying different regulations, although it is thought that the fisheries target the same biological stock. An allozyme-based study in the mid-1990s identified a weak genetic disjunction north of Sydney (NSW...
Source
#1Ashley M. Fowler (New South Wales Department of Primary Industries)H-Index: 14
#2Rowan C. Chick (New South Wales Department of Primary Industries)H-Index: 3
Last. John Stewart (New South Wales Department of Primary Industries)H-Index: 13
view all 3 authors...
Knowledge of connectivity and population structure is integral to the sustainable management of fished populations, yet such information is unavailable for many species over scales relevant to their exploitation. We examined broad-scale patterns and drivers of adult movement for a putatively mobile carangid (Pseudocaranx georgianus) on Australia’s southeast coast using an angler tag-recapture dataset. More than 6300 individuals were tagged and released across 1007 km of coastline, with anglers r...
1 CitationsSource
#1Stephanie Brodie (UNSW: University of New South Wales)H-Index: 7
#2L LitherlandH-Index: 1
Last. Iain M. Suthers (UNSW: University of New South Wales)H-Index: 36
view all 6 authors...
Understanding the processes driving species distributions is a key question in ecology, yet obtaining pertinent data for many species can be challenging. Tag-recapture data from voluntary recreational fisheries programmes is an undervalued citizen science data resource and can provide valuable observation records for data-poor species. Here, we highlight the utility of such data by compiling four tag-recapture datasets (n = 20 878 tags) to describe the movements and distribution of a piscivorous...
3 CitationsSource
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