Bibliografie tematiche / Fishing, australia, tasmania

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Letteratura scientifica selezionata sul tema "Fishing, australia, tasmania"

Autore: Grafiati

Pubblicato: 29 luglio 2024

Ultima modifica: 30 luglio 2024

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Articoli di riviste sul tema "Fishing, australia, tasmania"

Turnbull, Alison, Juan José Dorantes-Aranda, Tom Madigan, Jessica Jolley, Hilary Revill, Tim Harwood e Gustaaf Hallegraeff. "Field Validation of the Southern Rock Lobster Paralytic Shellfish Toxin Monitoring Program in Tasmania, Australia". Marine Drugs 19, n. 9 (8 settembre 2021): 510. http://dx.doi.org/10.3390/md19090510.

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Paralytic shellfish toxins (PST) are found in the hepatopancreas of Southern Rock Lobster Jasus edwardsii from the east coast of Tasmania in association with blooms of the toxic dinoflagellate Alexandrium catenella. Tasmania’s rock lobster fishery is one of the state’s most important wild capture fisheries, supporting a significant commercial industry (AUD 97M) and recreational fishing sector. A comprehensive 8 years of field data collected across multiple sites has allowed continued improvements to the risk management program protecting public health and market access for the Tasmanian lobster fishery. High variability was seen in toxin levels between individuals, sites, months, and years. The highest risk sites were those on the central east coast, with July to January identified as the most at-risk months. Relatively high uptake rates were observed (exponential rate of 2% per day), similar to filter-feeding mussels, and meant that lobster accumulated toxins quickly. Similarly, lobsters were relatively fast detoxifiers, losing up to 3% PST per day, following bloom demise. Mussel sentinel lines were effective in indicating a risk of elevated PST in lobster hepatopancreas, with annual baseline monitoring costing approximately 0.06% of the industry value. In addition, it was determined that if the mean hepatopancreas PST levels in five individual lobsters from a site were <0.22 mg STX equiv. kg−1, there is a 97.5% probability that any lobster from that site would be below the bivalve maximum level of 0.8 mg STX equiv. kg−1. The combination of using a sentinel species to identify risk areas and sampling five individual lobsters at a particular site, provides a cost-effective strategy for managing PST risk in the Tasmanian commercial lobster fishery.

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McMillan, M. N., C. Huveneers, J. M. Semmens e B. M. Gillanders. "Partial female migration and cool-water migration pathways in an overfished shark". ICES Journal of Marine Science 76, n. 4 (5 dicembre 2018): 1083–93. http://dx.doi.org/10.1093/icesjms/fsy181.

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Abstract Knowledge about reproductive movements can be of important conservation value for over-exploited species that are vulnerable when moving between and within key reproductive habitats. Lack of knowledge persists around such movements in the overfished school shark Galeorhinus galeus in Australia. Management assumes all pregnant females migrate between adult aggregations in the Great Australian Bight, South Australia, and nursery areas around Bass Strait and Tasmania. We tracked 14 late-term pregnant females tagged in South Australia using satellite-linked pop-up archival tags to investigate extent, timing, and routes of migrations. We found partial migration, with some females (n = 7) remaining near aggregating areas throughout the pupping season, some migrating to known nursery areas (n = 3), and one migrating ∼3 000 km to New Zealand. We conclude female movements and pupping habitats are less spatially constrained than assumed and propose females use cool-water routes along the shelf break to reduce energy costs of migration. Migrating females using these routes faced greater fishing pressure than sharks in inshore areas and were not protected by inshore shark fishing closures designed to protect them. This study demonstrates the complexity of reproductive movements that can occur in wide-ranging species and highlights the value of explicit movement data.

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Frusher, S. D., e J. M. Hoenig. "Estimating natural and fishing mortality and tag reporting rate of southern rock lobster (Jasus edwardsii) from a multiyear tagging model". Canadian Journal of Fisheries and Aquatic Sciences 58, n. 12 (1 dicembre 2001): 2490–501. http://dx.doi.org/10.1139/f01-182.

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Fishing and natural mortality rates and tag reporting rate for rock lobsters (Jasus edwardsii) in northwest Tasmania, Australia, were estimated using multiyear tagging models. These estimates are necessary for assessment of the resource. Several models were examined that had either two or three tagging events each year, and either combined sexes or kept sexes separate. The model that best described the dynamics of the fishery utilized three tagging events within a year. The year was divided into discrete periods and, within each year, fishing effort and duration of period were used to apportion fishing and natural mortalities, respectively, to the periods. The separation of fishing mortalities by sex was not found to improve the models. Although high (1.01.2·year1), the instantaneous fishing mortality estimates were comparable to estimates obtained from other methods and the relative standard errors were low. Reporting rate estimates were also precise and indicated a lack of participation by the fishing industry. Estimates of natural mortality were low (0.000.02·year1) but imprecise.

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Raoult, V., V. Peddemors, K. Rowling e J. E. Williamson. "Spatiotemporal distributions of two sympatric sawsharks (Pristiophorus cirratus and P. nudipinnis) in south-eastern Australian waters". Marine and Freshwater Research 71, n. 10 (2020): 1342. http://dx.doi.org/10.1071/mf19277.

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Sawsharks are one of the least well-known groups of sharks globally, yet they are caught in large numbers in south-eastern Australia. In this study we assessed spatiotemporal patterns of distribution of two co-occurring species of sawsharks, namely the common sawshark (Pristiophorus cirratus) and the southern sawshark (Pristiophorus nudipinnis), to guide future research in this area. To identify where the animals may occur in greater numbers, this study used the major commercial fishery datasets in the region, containing nearly 180000 catch records from 1990 to 2017. Several general patterns were evident. Sawsharks occurred at shallower and deeper depths than previously thought, and their geographical range was larger than documented in previous studies. Depth distributions of both species overlapped, but P. cirratus appeared more common in deeper water (at depths up to 500m), with peak common sawshark catch rates at ~400m. Seasonal standardised catch patterns across fishing methods suggested that migrations from deeper to shallower waters may occur in the Australasian autumn and winter. The greatest concentration of sawsharks, inferred by standardised catch rates, occurred to the east and west of Bass Strait between Tasmania and mainland Australia. Although standardised catch rates of sawsharks declined in gill-net fisheries by ~30%, primarily in the Bass Strait and Tasmania, sawsharks appear to be caught at consistent rates since the 1990s, inferring a possible resilience of these sharks to current levels of fishing pressure.

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Ziegler, Philippe E. "Fishing tactics and fleet structure of the small-scale coastal scalefish fishery in Tasmania, Australia". Fisheries Research 134-136 (dicembre 2012): 52–63. http://dx.doi.org/10.1016/j.fishres.2012.08.011.

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Knuckey, Ian A., e K. P. Sivakumaran. "Reproductive characteristics and per-recruit analyses of blue warehou (Seriolella brama): implications for the South East Fishery of Australia". Marine and Freshwater Research 52, n. 4 (2001): 575. http://dx.doi.org/10.1071/mf00022.

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Monthly samples of commercial catches of S. brama were collected between May 1996 and December 1997 in three regions of the fishery:off the east coast of Victoria; eastern Tasmania; and western Bass Strait. Sex ratio, gonadosomatic index, macroscopic and histological development, size at maturity and fecundity were estimated and combined with data on growth and mortality to perform per-recruit analyses. The main spawning period was during winter–spring and there was evidence of spawning in each of the three regions. Blue warehou reach maturity at 30–40 cm fork length. They have a determinate annual fecundity and spawn around three batches of eggs during a season. Eggs-per-recruit analyses revealed maximum egg production at ~40 cm (4–5 years) in an unfished population. Gill-net fishing, which targets fish >45 cm, was less likely to affect the relative eggs-per-recruit in a population than trawl fishing, which catches a wider range of smaller fish. These results are discussed in light of the current management arrangements in the fishery and will be used in models to assess the effect of fishing on the long-term sustainability of the blue warehou.

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Wakamatsu, Lael, Gregory L. Britten, Elliot J. Styles e Andrew M. Fischer. "Chlorophyll-a and Sea Surface Temperature Changes in Relation to Paralytic Shellfish Toxin Production off the East Coast of Tasmania, Australia". Remote Sensing 14, n. 3 (30 gennaio 2022): 665. http://dx.doi.org/10.3390/rs14030665.

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Toxic phytoplankton have been detrimental to the fishing and aquaculture industry on the east coast of Tasmania, causing millions of dollars in loss due to contaminated seafood. In 2012–2017, shellfish stocks were poisoned by Alexandrium catenella, a dinoflagellate species that produces paralytic shellfish toxins (PST). Remote sensing data may provide an environmental context for the drivers of PST events in Tasmania. We conducted spatial and temporal trend analyses of the Multi-Scale Ultra-High-Resolution Sea Surface Temperature (MUR SST) and Ocean Color Climate Change Initiative chlorophyll-a (OC-CCI chl-a) to determine if SST and chl-a correlated with the major toxin increases from 2012 to 2017. Along with the trends, we compare the remotely sensed oceanographic parameters of SST and chl-a to toxin events off the east coast of Tasmania to provide environmental context for the high-toxin period. Spatial and temporal changes for chl-a differ based on the north, central, and southeast coast of Tasmania. For sites in the north, chl-a was 5.3% higher from the pre-PST period relative to the PST period, 5.1% along the central part of the coast, and by 6.0% in the south based on deviations from the coastal study area time series. Overall, SST has slightly decreased from 2007 to 2020 (tau = −0.011, p = 0.827) and chl-a has significantly decreased for the east coast (tau = −0.164, p = 1.58 × 10−3). A negative relationship of SST and PST values occurred in the north (r = −0.530, p = 5.32 × 10−5) and central sites (r = −0.225, p = 0.157). The correlation between satellite chl-a (from OC-CCI, Visible Infrared Imaging Radiometer Suite (VIIRS), and Moderate-Resolution Imaging Spectrometer (MODIS) Aqua) and in situ data is weak, which makes it difficult to assess relationships present between chl-a and toxin concentrations. Moving forward, the development of a regional chl-a algorithm and increased in situ chl-a collection and plankton sampling at a species level will help to improve chl-a measurements and toxic phytoplankton production monitoring around Tasmania.

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Young, JW, RW Bradford, TD Lamb e VD Lyne. "Biomass of zooplankton and micronekton in the southern bluefin tuna fishing grounds off eastern Tasmania, Australia". Marine Ecology Progress Series 138 (1996): 1–14. http://dx.doi.org/10.3354/meps138001.

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Crawford, C., G. Edgar, C. L. Gillies e G. Heller-Wagner. "Relationship of biological communities to habitat structure on the largest remnant flat oyster reef (Ostrea angasi) in Australia". Marine and Freshwater Research 71, n. 8 (2020): 972. http://dx.doi.org/10.1071/mf19171.

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Oyster reef restoration is a growing field in Australia, yet formal descriptions of associated biological communities for reefs created by native flat oysters (Ostrea angasi) do not currently exist. Native flat oysters once formed extensive and complex three-dimensional habitats in bays and estuaries across southern Australia until indiscriminate fishing, sedimentation and disease led to their near disappearance. To determine the diversity and abundance on naturally occurring oyster reefs, we sampled four sites on the last known naturally occurring oyster reef ecosystem, which resides in north-eastern Tasmania, and compared them to the surrounding soft sediment regions. Assemblages were related to environmental variables to determine whether consistent patterns were present. Oyster reef sites contained three times the faunal abundance of the surrounding soft sediment regions. Abundance among echinoderms, arthropods, molluscs and fish was much elevated, whereas annelids showed similar levels of abundance but differed in terms of species composition. These results show that oyster reefs do support abundant and diverse assemblages, emphasising the probable loss of community-level biodiversity associated with their historical decline around southern Australia.

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Pocock, Celmara, David Collett e Joan Knowles. "False Promise: World Heritage, Ecotourism, and the Local Community of Strahan, Tasmania". Heritage 7, n. 2 (16 febbraio 2024): 1028–42. http://dx.doi.org/10.3390/heritage7020050.

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The inscription of properties on the World Heritage List often places restrictions on existing livelihoods. In these contexts, tourism is widely held to be a panacea for the economic and social wellbeing of local communities. Ecotourism, in particular, is regarded as addressing both environmental and social needs of communities. However, existing research demonstrates that tourism seldom delivers benefits to Indigenous peoples or local communities in developing countries. This paper suggests that such limitations are equally problematic for local communities in developed nations such as Australia. Through ethnographic research including participant observation and interviews, this paper describes the impacts of tourism on the local community of Strahan, a small logging, fishing, and mining town that transformed into a tourism village following the World Heritage listing of Southwest Tasmania. We suggest that contrary to the widely held view that tourism created employment and economic growth in the town, locals experience diminished quality of life, limited opportunities, and reduced amenity and services. This suggests that ecotourism overlooks its responsibilities for local communities in developed countries, with profound consequences for social sustainability.

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Più fonti

Libri sul tema "Fishing, australia, tasmania"

Scholes, D. Fly Fishing Pictorial. Simon & Schuster Australia, 1990.

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Finding Feeding Trout. Kangaroo Pr, 1995.

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Dry Fly-Fishing for Trout. Kangaroo Pr, 1994.

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Hundloe, Tor, e Christine Crawford, a cura di. Value of Water in a Drying Climate. CSIRO Publishing, 2012. http://dx.doi.org/10.1071/9780643106635.

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Are we making the best use of water? How do we judge this? Are there trade-offs between upstream and downstream water use? What are these and how are they resolved? Disputes over water allocations are, second to climate change, the dominant environmental and public policy issues of the present era. We are called upon to resolve such controversies using the principles of sustainable development, which integrates ecology, economics and ethics. This timely book establishes a template for all types of resource allocation disputes, whether in Australia or overseas. An expert team of ecologists, economists and sustainability experts spent three years interviewing people in the Little Swanport catchment, seeking answers to the optimal allocation of water on the Tasmanian East Coast. The hinterland of this area produces some of the most valuable merino wool in the world, the estuary grows mouth-watering oysters, and much of the land is in near-pristine condition, providing very valuable biodiversity resources. The book is written in an easy-to-read style and gradually evolves to become the story of everyday life of one small Australian catchment. It is about people living in rural settings in the upper catchment with soils and rainfall suitable for farming; people residing in coastal settlements in the lower catchment; people working and relaxing in the estuary where fishing and aquaculture occur; and people and their business in adjacent towns.

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