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Journal articles on the topic 'Australian Fishing Zone'
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1
Stevens, J. D., G. J. West, and K. J. McLoughlin. "Movements, recapture patterns, and factors affecting the return rate of carcharhinid and other sharks tagged off northern Australia." Marine and Freshwater Research 51, no. 2 (2000): 127. http://dx.doi.org/10.1071/mf98158.
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Between February 1983 and May 1985, ~10 500 sharks of 23 species were fin-tagged off northern Australia. Tagging concentrated on the commercially important Carcharhinus tilstoni and C. sorrah. Most recaptures were made in 1984 and 1985, but returns continued until May 1997. In all, 579 tags (5.5%) were recovered. Tag shedding was estimated to be low (0.025 year –1 for C. tilstoni) and tagging mortality was significantly lower for sharks caught by hand-line than by gill-net. Australian gill-netters, Taiwanese gill-netters (fishing in the Australian Fishing Zone) and Australian prawn trawlers accounted for most of the returns. The maximum distance between the release and recapture positions was >1100 km, but most returns were made within 50 km of the tagging site. Nearly all the releases were in inshore waters fished by Australian vessels. Although many recaptures were made by the offshore Taiwanese fishery, the Taiwanese fishing effort was much higher than for the inshore Australian fishery, so that relative to fishing effort, relatively few sharks moved from inshore to offshore waters.
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Hoeppe, Götz. "Boats to burn: Bajo fishing activity in the Australian fishing zone - By Stacey, Natasha." Journal of the Royal Anthropological Institute 16, no. 1 (March 2010): 184–85. http://dx.doi.org/10.1111/j.1467-9655.2009.01604_19.x.
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EDGAR, GRAHAM J., and NEVILLE S. BARRETT. "An assessment of population responses of common inshore fishes and invertebrates following declaration of five Australian marine protected areas." Environmental Conservation 39, no. 3 (July 6, 2012): 271–81. http://dx.doi.org/10.1017/s0376892912000185.
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SUMMARYIn order to better understand community-level effects of fishing on temperate reefs at continental scales, changes in densities of common species in five Australian marine protected areas (MPAs) were estimated from prior to establishment to three years after enforcement of fishing prohibitions. A before-after-control-impact survey design was used, with 5–14 replicated sites distributed within both sanctuary and fishing zones associated with each MPA. On the basis of published meta-analyses, exploited species were generally expected to show increased densities. By contrast, only two of the 11 exploited fish species (the red morwongCheilodactylus fuscusand latrid trumpeterLatridopsis forsteri), and none of seven exploited invertebrate species, showed significant signs of population recovery within sanctuary zones. Four fish species increased in biomass between survey periods. When variation in abundance data was partitioned by PERMANOVA independently for the five MPAs, the ‘zone × year’ interaction component consistently contributed onlyc.4% of total variation, compared to site (c.35%), zone (c.8%), year (c.8%) and residual error (c.45%) components. Given that longer-term Australian studies show clear community-wide responses following MPA protection, the discrepancy between weak observed recovery anda prioriexpectations is probably due, at least in part, to the three-year period studied being insufficient to generate clear trends, to relatively low fishing pressure on some temperate Australian reefs, and to meta-analyses overestimating the likelihood of significant short-term population responses.
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Stevens, JD. "Blue and Mako Shark by-catch in the Japanese Longline Fishery off South-eastern Australia." Marine and Freshwater Research 43, no. 1 (1992): 227. http://dx.doi.org/10.1071/mf9920227.
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During the last 10 years, up to 70 Japanese longline vessels have fished Tasmanian waters of the Australian Fishing Zone each season, targeting bluefin tuna (Thunnus maccoyii). The average seasonal fishing effort in Tasmanian waters is about 3.3 million hooks, and data from observers suggests that, this results in a by-catch of some 34 000 blue sharks (Prionace glauca) each year, representing a weight of about 275 tonnes. In the last few years, fishing effort has increased as the catch rates of southern bluefin tuna have declined. The sharks are discarded after removal of the fins. The actual number of blue sharks hooked is much higher than 34000 because many are released by either shaking or cutting them off the line, although they are often damaged in the process. The majority of blue sharks caught are immature or adolescent females. Smaller numbers of shortfin mako sharks (Isurus oxyrinchus) are also caught and retained both for their fins and their meat. Tasmanian waters represent only one area of the Australian Fishing Zone fished by Japanese longliners.
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Welch, David J., Bruce D. Mapstone, Campbell R. Davies, and Garry R. Russ. "Spatial and fishing effects on sampling gear biases in a tropical reef line fishery." Marine and Freshwater Research 61, no. 10 (2010): 1134. http://dx.doi.org/10.1071/mf09278.
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Biased estimates of population parameters for harvested stocks can have severe implications for fishery management strategy choices. Hook-and-line fishing gear is size-selective and therefore collects biased samples from wild populations. Such biases may also vary in space and time. To assess this assertion, we compared line- and spear-caught samples of the main target species of an Australian hook-and-line fishery to quantify relative bias in size and age structure estimates. We also assessed the consistency of biases among four fishery regions and between two management zones – areas open and closed to fishing. Fish less than 310 mm and younger than 4 years comprised a larger proportion of the speared than the line samples regardless of region or management zone. Conversely, hook-and-line sampled more fish in larger size classes (>370 mm) and older age classes (≥6 years) relative to spear fishing. These biases were qualitatively, but not quantitatively, consistent in all regions and management zones. This variation in sampling resulted in different inferences about regional and zone-related patterns in population size and age structure. We recommend careful consideration of sampling bias when drawing conclusions about regional and management zone effects on fish populations.
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Prabawaningtyas, Shiskha. "Contested Space of Transborder Fishing in Timor and Arafura Seas." Indonesian Historical Studies 1, no. 1 (June 5, 2017): 1. http://dx.doi.org/10.14710/ihis.v1i1.1233.
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The continuity of Indonesian transborder fishing activities into Australian Fishing Zone (AFZ) highlights the rooted dispute of maritime border when contested space of boundary shared by local, state and international actor is confronted. Therefore, the prevailing of multilayer perspective of maritime boundary should not be easily neglected. The colonial project in early 19th century in Southeast Asia that initiated the foundation of modern state-formation had challenged the prior-political and economic construction of the region, specifically on the issue of territoriality. The modernization of shipping and fishing activities of which relied on technology and capitals had generated political and economic competitions and later persuaded state’s actors of applying the strategy of the territorialisation of the sea in order to ensure control. Unavoidably, securitization of transborder fishing became preferable solution. Transborder fishings are further subjected into state control relied on territorial sovereignty.This paper examines the transformation of transborder fishing in Timor and Arafura Sea to demonstrated the contested space of which interplayed by local, state and international actor. State regulations had transformed transborder fishing into political space of authority competition relied on territorial sovereignty, while socio-cultural heritage reminds exploited within fluid space of livelihood survival when state function is just absent.
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Creighton, Colin, Paul I. Boon, Justin D. Brookes, and Marcus Sheaves. "Repairing Australia's estuaries for improved fisheries production – what benefits, at what cost?" Marine and Freshwater Research 66, no. 6 (2015): 493. http://dx.doi.org/10.1071/mf14041.
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An Australia-wide assessment of ~1000 estuaries and embayments undertaken by the National Land and Water Resources Audit of 1997–2002 indicated that ~30% were modified to some degree. The most highly degraded were in New South Wales, where ~40% were classified as ‘extensively modified’ and <10% were ‘near pristine’. Since that review, urban populations have continued to grow rapidly, and increasing pressures for industrial and agricultural development in the coastal zone have resulted in ongoing degradation of Australia's estuaries and embayments. This degradation has had serious effects on biodiversity, and commercial and recreational fishing. A business case is developed that shows that an Australia-wide investment of AU$350 million into repair will be returned in less than 5 years. This return is merely from improved productivity of commercial fisheries of a limited number of fish, shellfish and crustacean species. Estuary repair represents an outstanding return on investment, possibly far greater than most of Australia's previous environmental repair initiatives and with clearly demonstrated outcomes across the Australian food and services economies.
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Linnane, A. J., S. S. Penny, and T. M. Ward. "Contrasting fecundity, size at maturity and reproductive potential of southern rock lobster Jasus edwardsii in two South Australian fishing regions." Journal of the Marine Biological Association of the United Kingdom 88, no. 3 (May 2008): 583–89. http://dx.doi.org/10.1017/s0025315408001021.
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The annual commercial catch from the Southern Zone of the South Australian rock lobster (Jasus edwardsii) fishery is ~1900 tonnes, representing ~50% of total landings from south-east Australia. A single minimum legal size (MLS) of 98.5 mm carapace length (CL) exists across the entire zone. Fecundity (F), size at onset of maturity (SOM) and relative reproductive potential (RRP) of female rock lobsters were investigated in two major fishing regions, i.e. the North Southern Zone (NSZ) and South Southern Zone (SSZ) with a view to providing a basis for future fine-scale spatial management of the resource. F ranged from 45,292 to 466,800 eggs per female and increased proportionally with CL according to the relationship: F = 0.0584 × CL3.1642. F was significantly higher in the NSZ compared to the SSZ but was attributed to differences in lobster size between regions. There was no significant difference in the number of eggs · g−1 of egg mass between areas. SOM, estimated as the size at which 50% of females reached sexual maturity (L50) was higher in the NSZ (104.1 mm CL) compared to SSZ (92.3 mm CL). Approximately 20% of lobsters above the MLS in the commercial catch in the NSZ were under the L50 estimate. RRP, as a measure of egg production, was calculated for each size-class from the product of F, SOM and population length–frequency. The modal RRP size-classes in the NSZ were 117.5–122.5 mm CL, while in the SSZ it was 97.5–102.5 mm CL. Only 6% of RRP was contributed by female rock lobsters below the MLS in the NSZ, compared to 34% in the SSZ. Regional differences in SOM and RRP in the Southern Zone of South Australia suggest that different MLSs may be beneficial, particularly if the fishery is to be effectively managed at finer spatial scales.
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Bell, Catherine, Peter Shaughnessy, Margie Morrice, and Bob Stanley. "Marine mammals and Japanese long-line fishing vessels in Australian waters: operational interactions and sightings." Pacific Conservation Biology 12, no. 1 (2006): 31. http://dx.doi.org/10.1071/pc060031.
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Observers from the Australian Fisheries Management Authority worked on randomly chosen Japanese long-line vessels in the Australian Fishing Zone (AFZ) between 1980 and 1997. Observer reports (n = 451) were inspected for interactions or sightings of marine mammals. An operational interaction was defined as an activity or behaviour that involved direct contact between a marine mammal and fishing gear, bait, target fish or bycatch, or indications that the marine mammal was feeding. A sighting was defined as the recording of marine mammals that passed the vessel without changing course and/or did not appear to interact with the vessel or its gear. Observers witnessed 23 interactions and made another 44 sightings of marine mammals. A further 24 interactions and sightings were relayed by crew members. Killer whales were reported most frequently: most incidences of fish being damaged, taken or frightened away were attributed to them. Eleven marine mammals were caught: two died, seven were released, and the fate of two others was not recorded. Between 1991 and 1996, when observer coverage was 11.5% overall in the AFZ, the incidence of interactions was 1.71 per million hooks set. The estimated number of interactions in that seven-year period was 157 in the AFZ. Since 1997, the long-line fishery has been conducted by Australian vessels, primarily off the east coast of mainland Australia in warm-temperate waters. A higher proportion of interactions can be expected with killer whales and short-finned pilot whales in these waters, and fewer with seals.
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Kaye, Stuart, and Donald R. Rothwell. "Australian law in Antarctica." Polar Record 29, no. 170 (July 1993): 215–18. http://dx.doi.org/10.1017/s0032247400018519.
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ABSTRACTThis article examines the content and ramifications of an Australian Parliamentary Committee's Report into the application of Australian law in the Australian Antarctic Territory (AAT). The Report's main findings suggest that Australian law should be more vigorously applied in Antarctica, and that current practices with regard to the operation and enforcement of Australian law are perceived as damaging to Australian sovereignty. This is particularly the case in the context of the virtual non-application of law to all foreign nationals within the AAT, to an extent far beyond the categories of persons exempted by Article VIII of the Antarctic Treaty. The article also discusses the possible ramifications and difficulties of giving effect to the Report's findings. Particular stress is placed upon the impact of asserting a 200-nautical-mile fishing or exclusive economic zone in the waters off the AAT, as well as the logistic difficulties that may become apparent if Australian sovereignty is more actively asserted. In this context, brief consideration is given to the Report's recommendations relating to the Antarctic environment and tourism within the AAT.
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Hampton, John, and John Gunn. "Exploitation and movements of yellowfin tuna (Thunnus albacares) and bigeye tuna (T. obesus) tagged in the north-western Coral Sea." Marine and Freshwater Research 49, no. 6 (1998): 475. http://dx.doi.org/10.1071/mf97210.
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Yellowfin tuna (Thunnus albacares) and bigeye tuna (T. obesus) were tagged and released in the north-western Coral Sea off northern Queensland in 1991 and 1992. Over the next five years, recaptures were reported by Australian longline vessels based in Cairns and fishing in the release area, and by industrial tuna fleets fishing in the adjacent western Pacific region, thus demonstrating clear links between the tuna stocks in these areas. Some southerly movements of yellowfin, in particular, further suggested links with stocks supporting the longline fishery in the south-eastern Australian Fishing Zone. Bigeye tuna tag returns and catch per unit effort by Cairns-based longliners showed a strong seasonal signal, peaking in mid year. Yellowfin tag-return data displayed a similar, but weaker, seasonal pattern. The data were analysed by use of tag-attrition models with seasonally variable catchability and with two assumptions regarding changes in targeting of the two species by longliners during the study. Under both assumptions, the local exploitation rates for yellowfin are low: about 0.07 in 1996. For bigeye, the local exploitation rate in 1996 may have been as high as 0.30, warranting a cautious approach to further fishery expansion in this area.
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McPherson, GR. "Reproductive biology of yellowfin tuna in the eastern Australian Fishing Zone, with special reference to the north-western Coral Sea." Marine and Freshwater Research 42, no. 5 (1991): 465. http://dx.doi.org/10.1071/mf9910465.
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Developmental stages of oocyte maturation and degenerative stages of postovulatory follicles in yellowfin tuna from the eastern Australian Fishing Zone of the Coral Sea are described. The time of spawning of yellowfin appeared to be during the late evening and early morning. Final oocyte maturation occurred in less than 24 h; postovulatory follicles could not be identified in ovaries after 24 h. Spawning of yellowfin commenced in the north-western Coral Sea by October and had ceased in the central-western Coral Sea by late February. The duration of spawning appeared to be less protracted in the south-western Coral Sea. The average spawning frequency of female yellowfin in the western Coral Sea was once every 1.54 days. Significant differences in spawning frequency were found between different size classes of yellowfin; larger fish spawned more frequently. The spawning stock of yellowfin in the north-western and central-western Coral Sea could be the major source of recruits for the tuna fisheries off the eastern coast of Australia.
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Dunning, M., and SB Brandt. "Distribution and life history of deep-water squid of commercial interest from Australia." Marine and Freshwater Research 36, no. 3 (1985): 343. http://dx.doi.org/10.1071/mf9850343.
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Squid of continental slope and oceanic waters are not currently fished commercially within the Australian Fishing Zone although one species has been caught occasionally in commercial quantities. At least eight species of the cosmopolitan family Ommastrephidae and a variety of mostly mesopelagic species of the families Enoploteuthidae and Onychoteuthidae are represented in Australian waters. The large ommastrephid species Ommastrephes bartrami (red ocean squid), Todarodes filippovae (Southern Ocean arrow squid) and Sthenofeuthis oualaniensis (yellowback squid) have the greatest potential for commercial use. Data on the life history and distribution of the common species are synthesized to provide a baseline for future scientific studies and management strategies.
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Chen, Li, and John Ryan. "Abalone in Diasporic Chinese Culture: The Transformation of Biocultural Traditions through Engagement with the Western Australian Environment." Heritage 1, no. 1 (July 19, 2018): 122–41. http://dx.doi.org/10.3390/heritage1010009.
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In October 2017, the Department of Primary Industries and Regional Development of Western Australia (WA) promulgated a new regulation on recreational abalone harvesting. A notable change was that, from 2017 on, the annual fishing season in the West Coast Zone was reduced to four days, from every December on Saturdays only. During the last decade, WA’s abalone fishing regulations have been overhauled frequently because of depleting local stocks. Worldwide, the marine heatwave resulting from climate change and illegal overfishing are considered the two principal reasons for abalone’s decline. Today, the highly lucrative abalone market has attracted more participants in recreational fishing in Perth, WA. Based on Asian natural heritage traditions and employing a multispecies sensory ethnographic methodology, this article provides an in-depth case study of the interaction between the local Chinese diaspora and the environment as represented in abalone harvesting practices. Between 2014 and 2016, the authors conducted one-on-one and focus group interviews with Chinese immigrants to Perth, WA, and also participated in abalone harvesting. The analysis reveals a suite of environmental influences on local Chinese diasporic life through heterogeneous forms of interaction between abalone and Perth-area Chinese immigrants.
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Klaer, Neil, and Tom Polacheck. "By-catch of Albatrosses and other Seabirds by Japanese Longline Fishing Vessels in the Australian Fishing Zone from April 1992 to March 1995." Emu - Austral Ornithology 97, no. 2 (June 1997): 150–67. http://dx.doi.org/10.1071/mu97019.
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Brothers, N., R. Gales, and T. Reid. "The influence of environmental variables and mitigation measures on seabird catch rates in the Japanese tuna longline fishery within the Australian Fishing Zone, 1991–1995." Biological Conservation 88, no. 1 (April 1999): 85–101. http://dx.doi.org/10.1016/s0006-3207(98)00085-8.
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Dryden, Jennifer, Alana Grech, James Moloney, and Mark Hamann. "Rezoning of the Great Barrier Reef World Heritage Area: does it afford greater protection for marine turtles?" Wildlife Research 35, no. 5 (2008): 477. http://dx.doi.org/10.1071/wr07087.
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In 2004 the Australian Government implemented a revised zone-based management plan for the Great Barrier Reef World Heritage Area to increase protection of representative areas while minimising the impacts to the economic viability of important industries. In this study we evaluated the current zoning plan for its capacity to protect marine turtles from commercial trawling and netting activities at nesting sites and at inshore and offshore foraging areas to assess whether the Great Barrier Reef Marine Park Authority met their obligations under the Representative Areas Program (RAP). We found that protection from commercial fisheries increased within 5- and 10-km buffer zones of all very-high, high- and medium-priority nesting sites that were previously less than 100% protected. However, three very-high-priority sites and six high-priority sites remain less than 100% protected out to 5 km, falling short of the objectives of the RAP. There were variable increases in protection at foraging areas; however, each of them increased in the proportion of area protected from commercial fishing, fulfilling the objectives of the RAP. By using a broader-scale fisheries by-catch dataset as a proxy for turtle abundance we found that improvements in protection are not species-specific and can be attributed to the step-wise increases in protection since the mid 1990s.
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Baird, Rachel. "Australia's Response to Illegal Foreign Fishing: A Case of winning the Battle but losing the Law?" International Journal of Marine and Coastal Law 23, no. 1 (2008): 95–124. http://dx.doi.org/10.1163/092735208x272292.
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AbstractThe right of prompt release has been interpreted by the International Tribunal for the Law of the Sea as a safeguard, balancing the right of the coastal State to detain and deal with arrested fishing vessels and crew on the one hand, with the interests of the flag State to secure the release of detained vessels on the other. As the incidence of illegal fishing within national fishing zones has increased in the past decade, many coastal States, such as Australia, have implemented increasingly harsh penalties aimed at deterring the fishers. One such measure involves the operation of an automatic forfeiture regime whereby the detained vessel, gear and catch are forfeited to the Commonwealth. This regime operates in the absence of any judgement on the merits. This paper examines the details of the Australian legislation in addition to recent case law and concludes that the operation of the automatic forfeiture regime has the potential to upset the balance established in Article 73 of the 1982 United Nations Convention on the Law of the Sea.
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Letts, David J. "The use of force in patrolling Australia's fishing zones." Marine Policy 24, no. 2 (March 2000): 149–57. http://dx.doi.org/10.1016/s0308-597x(99)00026-3.
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Kenyon, R. A., R. C. Babcock, Q. Dell, E. Lawrence, C. Moeseneder, and M. L. Tonks. "Business as usual for the human use of Moreton Bay following marine park zoning." Marine and Freshwater Research 69, no. 2 (2018): 277. http://dx.doi.org/10.1071/mf16400.
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The multiple-use Moreton Bay Marine Park in eastern Australia was rezoned in 2009, increasing the total no-take marine national park (MNP) from 0.5 to 16%. In the present study we measured trends in the human use of no-take areas using observed vessel position and categorisation during on-water and aerial surveys before and after rezoning. Measured changes in spatial patterns of fishing showed that the effects of rezoning on most fishing activity was minimal. After rezoning, the proportion of recreational fishing declined from 6.3 to 2.6% of the footprint in the new MNPs. The proportion of commercial fishing declined from 25 to 1%, although the amount of commercial fishing was low. There was an overall increase in fishing activity on Moreton Bay. Low recreational fisher displacement suggests that the expansion of the MNP area did not have a high social cost. However, most of the no-take zones were areas not previously subject to high recreational fishing pressure. If a significant proportion of the no-take zones were placed in areas of low ecological production, the biodiversity conservation impact achieved by the rezoning of Moreton Bay may have been less than the 16% increase in no-take areas would imply.
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Hall, Norman G. "Delay-difference model to estimate the catch of different categories of the western rock lobster (Panulirus cygnus) for the two stages of the annual fishing season." Marine and Freshwater Research 48, no. 8 (1997): 949. http://dx.doi.org/10.1071/mf97109.
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The annual exploitation rate of the limited-entry rock lobster fishery of Western Australia is controlled by constraining the total allowable effort. An important aspect of the harvest strategy introduced in 1993 was the use of annual levels of allowed fishing effort that could be varied in accordance with predicted levels of recruitment to the fishery in order to increase the abundance of spawning females and to reduce the variability in the level of annual catch. A model was needed that could examine the impact of alternative management strategies on the catches both within and between fishing seasons. The model that has been developed uses a delay-difference structure in which the fishing season is divided into two periods. Growth between the periods, and over the closed fishing season, is determined from tagging data. Recruitment is estimated from the observed levels of puerulus settlement. The model has been fitted to the observed effort within the southern sector of the fishery. This model allows the evaluation of alternative levels of fishing effort within the management zone, providing managers and industry with a tool to explore alternative harvest strategies.
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McLeay, Lachlan, Adrian Linnane, Richard McGarvey, Simon Bryars, and Peter Hawthorne. "Response of a southern rock lobster (Jasus edwardsii) population to three years of Marine Protected Area implementation within South Australia." Journal of the Marine Biological Association of the United Kingdom 101, no. 1 (January 21, 2021): 141–49. http://dx.doi.org/10.1017/s0025315420001332.
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AbstractThe Western Kangaroo Island Marine Park (WKIMP) was declared as part of South Australia's representative system of Marine Protected Areas in 2009. Sanctuary Zone 3 (SZ-3) of the WKIMP is a no-take area protected from fishing since 1 October 2014 and is located within the Northern Zone Rock Lobster Fishery (NZRLF). In February 2017, a dedicated survey was undertaken to estimate the relative abundance (catch per unit effort (CPUE), kg/potlift) and size of southern rock lobster (Jasus edwardsii) inside and outside SZ-3. Survey results were then compared with historical estimates of abundance and size obtained from commercial fishery-dependent data. Survey estimates of relative abundance of legal-size lobsters were 4.4 times greater inside SZ-3 compared with outside in 2017. Since 2014, when fishing was last permitted inside SZ-3, the relative abundance of lobsters increased by 75%. The mean size of legal-size female and male lobsters also increased by 4.1% and 12.5%, respectively. The population responses recorded are consistent with the results recorded for southern rock lobster stocks in marine parks in other jurisdictions.
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Gullett, Warwick, and Clive Schofield. "Pushing the Limits of the Law of the Sea Convention: Australian and French Cooperative Surveillance and Enforcement in the Southern Ocean." International Journal of Marine and Coastal Law 22, no. 4 (2007): 545–83. http://dx.doi.org/10.1163/157180807782512224.
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AbstractThis article examines recent steps taken by Australia and France to combat illegal fishing in their claimed maritime zones of jurisdiction around their adjacent sub-Antarctic island territories. These steps comprise operational responses and legal developments, including the conclusion of two bilateral treaties on cooperative surveillance and enforcement. Geographical and legal problems associated with addressing the illegal fishing threat in the Southern Ocean are highlighted. It is concluded that when they come to be tested by international legal authorities, some of the more innovative legal measures under discussion are likely to be appraised as being in conflict with some provisions of the United Nations Convention on the Law of the Sea.
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Zeller, Dirk C., and Garry R. Russ. "Marine reserves: patterns of adult movement of the coral trout (Plectropomus leopardus (Serranidae))." Canadian Journal of Fisheries and Aquatic Sciences 55, no. 4 (April 1, 1998): 917–24. http://dx.doi.org/10.1139/f97-311.
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Movements of Plectropomus leopardus (Serranidae), a major fisheries species, across marine reserve boundaries were investigated on the Great Barrier Reef, Australia. Mark-release-recapture and ultrasonic telemetry were used to assess movements. Mark-release-recapture used hook and line as the method of capture and underwater visual census (UVC) as the "recapture" tool. Catch rates were significantly higher in zones closed to fishing, despite UVC indicating no significant differences in density between closed and open zones. Of 183 fish marked with numerical freeze brands, 93 estimates of movements of branded fish were obtained. No branded fish was recorded to cross the reserve boundaries during the 2-month study, probably due to the initial decision to allocate capture effort evenly across the study area, rather than concentrating it on reserve boundaries. Fish carrying ultrasonic transmitters, and having home ranges straddling reserve boundaries, crossed boundaries on average 15.3 times ·month-1. The mean distance moved by freeze branded specimens between capture and recapture was significantly larger in areas closed to fishing than in those open to fishing. However, mean distance moved per day determined by ultrasonic telemetry did not differ between areas closed and open to fishing. This study suggests low flux rates of adult P. leopardus across marine reserve boundaries.
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Mariane, Irene. "ILLEGAL FISHING DI KAWASAN PERBATASAN LAUT TERITORIAL INDONESIA." SUPREMASI HUKUM 16, no. 1 (August 27, 2020): 7–15. http://dx.doi.org/10.33592/jsh.v16i1.714.
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Sebagai negara kepulauan, batas perairan kepulauan Indonesia terdiri dari batas laut teritorial, batas Zona Ekonomi Eksklusif (ZEE) dan Batas Landas Kontinen. Posisi Negara Indonesia berbatasan langsung dengan banyak negara lain, berbatasan darat dengan Malaysia, Papua Nugini (PNG), dan Timor Leste, sedangkan berbatasan laut dengan 10 negara, yaitu India, Malaysia, Singapura, Thailand, Vietnam, Filipina, Republik Palau, Australia, Timor Leste dan Papua Nugini (PNG). Perairan Indonesia yang berbatasan langsung dengan negara tetangga tersebut sering kali menjadi akses terjadinya kejahatan transnasional, antara lain illegal fishing. Walaupun telah ada beberapa peraturan perundang-undangan yang mengatur kegiatan illegal fishing, namun masih saja sering terjadi kegiatan illegal fishing yang dilakukan oleh negara-negara tetangga tersebut. Luasnya wilayah perarian Indonesia sehingga pengawasan pemerintah di kawasan perbatasan perairan belum optimal, minimnya fasilitas teknologi pengamanan perbatasan yang baik dan masih minimnya pelibatan peran serta nelayan-nelayan tradisional, menjadi faktor-faktor penyebab terjadinya illegal fishing. Kegiatan ilegal fishing tidak semata-mata menjadi persoalan Indonesia, tetapi juga menjadi persoalan lintas negara karena para pelaku dan kegiatannya lintas negara. Oleh karena itu penanganan persoalan ini harus dilakukan secara lintas negara, baik dengan menetapkan langkah-langkah strategis maupun melalui kerja sama bilateral.
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Kobayashi, Genki, Ryo Mukai, and Hajime Itoh. "New record of Halla okudai Imajima, 1967 (Annelida, Eunicida, Oenonidae) from Fukue Island in the Goto Islands, Japan." Check List 16, no. 5 (September 21, 2020): 1199–203. http://dx.doi.org/10.15560/16.5.1199.
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Halla okudai Imajima, 1967 is an oenonid annelid species that inhabits the intertidal and shallow subtidal zones in China, Malaysia, Australia and Japan. This species is harvested and used as fishing bait in Japan and Malaysia; however, it has been regarded as Near Threatened in Japan based on the categories of the Japanese Red List. Here, we reconstructed the molecular phylogeny of Oenonidae based on 16S rRNA gene sequences. This study provides a new record of H. okudai on Fukue Island, in the Goto Islands, Japan.
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Van Houtan, Kyle S., Tyler O. Gagné, Gabriel Reygondeau, Kisei R. Tanaka, Stephen R. Palumbi, and Salvador J. Jorgensen. "Coastal sharks supply the global shark fin trade." Biology Letters 16, no. 10 (October 2020): 20200609. http://dx.doi.org/10.1098/rsbl.2020.0609.
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Progress in global shark conservation has been limited by constraints to understanding the species composition and geographic origins of the shark fin trade. Previous assessments that relied on earlier genetic techniques and official trade records focused on abundant pelagic species traded between Europe and Asia. Here, we combine recent advances in DNA barcoding and species distribution modelling to identify the species and source the geographic origin of fins sold at market. Derived models of species environmental niches indicated that shark fishing effort is concentrated within Exclusive Economic Zones, mostly in coastal Australia, Indonesia, the United States, Brazil, Mexico and Japan. By coupling two distinct tools, barcoding and niche modelling, our results provide new insights for monitoring and enforcement. They suggest stronger local controls of coastal fishing may help regulate the unsustainable global trade in shark fins.
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Weekers, Damian P., Renee Zahnow, and Lorraine Mazerolle. "Conservation Criminology: Modelling Offender Target Selection for Illegal Fishing in Marine Protected Areas." British Journal of Criminology 59, no. 6 (March 27, 2019): 1455–77. http://dx.doi.org/10.1093/bjc/azz020.
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AbstractThe emergence of conservation criminology over the past decade provides a unique insight into patterns of wildlife crime. Wildlife crime has a dramatic impact on many vulnerable species and represents a significant challenge to the management of protected areas around the world. This paper contributes to the field of conservation criminology by examining the travel patterns of fishing poachers in the Great Barrier Reef Marine Park in Australia. The results demonstrate that distance is a key feature of offender target selection, reflecting the established environmental criminology concept of distance decay. The analysis also reveals a significant relationship between individual no-take zones and regional population areas. The applicability of a nodal-oriented approach to wildlife crime prevention is discussed.
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Hobday, David, and André E. Punt. "Size-structured population modelling and risk assessment of the Victorian southern rock lobster, Jasus edwardsii, fishery." Marine and Freshwater Research 52, no. 8 (2001): 1495. http://dx.doi.org/10.1071/mf01050.
Full textAbstract:
Current annual landings of southern rock lobster, Jasus edwardsii, from southeastern Australia are around 5000 tonnes valued at A$140 million. The Victorian component of this catch during the 1998-99 fishing season was 550 t, valued at A$18 million. During the past 20 years catch rates have declined from 0.8 kg per pot lift to 0.6 and 0.3 kg per pot lift in the western and eastern management zones respectively. The fishery has been managed with input controls during this period, but at the time of writing, the direction of future management is not clear. A size-structured model was developed to assess risk associated with both effort (input) and catch (output) controlled harvest strategies in each zone. The stock-assessment model was fitted to historical catch data (in weight and by number) from 1951, catch rates, and the length-frequency by sex. The uncertainty associated with the estimates of exploitable biomass and egg production was assessed according to Bayesian methods. The output of the assessment formed the basis for projections intended to determine the risk associated with different future levels of effort and catch. Reference points based on estimated biomass and egg production relative to the start of the data series in 1951 were considered.
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Wakefield, Corey B., Stephen J. Newman, and Brett W. Molony. "Age-based demography and reproduction of hapuku, Polyprion oxygeneios, from the south coast of Western Australia: implications for management." ICES Journal of Marine Science 67, no. 6 (March 26, 2010): 1164–74. http://dx.doi.org/10.1093/icesjms/fsq021.
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Abstract Wakefield, C. B., Newman, S. J., and Molony, B. W. 2010. Age-based demography and reproduction of hapuku, Polyprion oxygeneios, from the south coast of Western Australia: implications for management. – ICES Journal of Marine Science, 67: 1164–1174. The hapuku, Polyprion oxygeneios, inhabits deep (>100 m) continental slope waters of Western Australia. In all, 1352 P. oxygeneios were collected from the waters along the south coast of Western Australia (ca. 35°S) from 2004 to 2008. The species is gonochoristic, and spawns during the austral winter (May–September). Ages were estimated from counts of opaque zones from thin-sectioned sagittal otoliths. Classification analysis of the outer margin of sectioned otoliths indicated that a single opaque zone is deposited annually. Female P. oxygeneios (n = 630; 535–1114 mm total length, TL) ranged in age from 2 to 35 years and males (n = 691; 521–1004 mm TL) from 2 to 52 years. von Bertalanffy growth models for male and female P. oxygeneios were statistically, but not biologically, different (<5% difference in mean and estimated lengths-at-age). Estimates of the lengths and ages at which 50% of the females and males in the population reached sexual maturity were 760 and 702 mm TL and 7.1 and 6.8 years. The instantaneous rate of natural mortality (M) was estimated to be 0.09. Estimates of the instantaneous rate of fishing mortality (F) were low (0.01–0.05). Harvest rates in 2005 and 2006 were close to estimated sustainable levels. Monitoring of any future increases in catch and effort in continental slope waters in both State- and Commonwealth-managed fisheries is required in order to assess impacts to stock sustainability. Sustainable management would also benefit from improved understanding of possible pan-oceanic recruitment of the species among southern hemisphere populations.
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Walsh, Chris T., Charles A. Gray, Ron J. West, Dylan E. van der Meulen, and Lindsay F. G. Williams. "Growth, episodic recruitment and age truncation in populations of a catadromous percichthyid, Macquaria colonorum." Marine and Freshwater Research 61, no. 4 (2010): 397. http://dx.doi.org/10.1071/mf09080.
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Temperate basses and perches (family Percichthyidae) worldwide have declined in distribution and abundance during the past few decades due to anthropogenic impacts such as fishing, habitat degradation and alteration to river flows. This study examined differences in the age, growth and longevity of Macquaria colonorum among three south-eastern Australian coastal rivers. Estimates of ages were made by counting opaque zones in sectioned otoliths. Ages were validated by using marginal increment analysis, staining fish otoliths with oxytetracycline and sampling young-of-the-year fish. Length-at-age data from 1644 fish indicated that growth of M. colonorum is rapid in the first 3 to 4 years, after which it slows considerably. Females grew faster and reached larger asymptotic lengths than males. The species was found to be long lived, with the oldest fish estimated at 41 years. Population age structures indicated variable year-class strengths in all three rivers and there was an absence of larger, older (>10 years) individuals in the populations from the two rivers with a history of commercial fishing. These results indicate that M. colonorum populations, similar to other global percichthyid and estuarine-dependent fishes, have been subjected to episodic recruitment and age truncation and that these are likely influenced by environmental flows and fishing pressure.
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Aouad, Andrew, Randall Taylor, Neil Millar, Robert Meagher, and Deidre Brooks. "Seismic on the edge—the Speculant 3D Transition Zone Seismic Survey." APPEA Journal 52, no. 1 (2012): 327. http://dx.doi.org/10.1071/aj11025.
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The Speculant 3D Transition Zone (TZ) Seismic Survey was acquired by Origin Energy in the Otway Basin, about 30 km east of Warrnambool, Victoria, during November and December 2010. The objective of the survey was to fill a data gap between existing marine and land 3D seismic surveys. Although the survey covered a small surface area, it included part of the Bay of Islands Coastal Park, dairy farms, southern rock lobster fishing grounds and the migration route for the Southern Right Whale. Numerous exclusion zones were required to address a variety of stakeholder concerns, avoid environmentally sensitive areas, combat a physical landscape dominated by 60 m sea cliffs and the large Southern Ocean surf. These access restrictions required the innovative use of modern seismic technology to enable a survey that could simultaneously record onshore and offshore without a physical connection between recording systems. On land a GSR cable-free recording system was used for the first time in Australia, eliminating the need for any line preparation or vegetation clearing. Offshore an ocean bottom cable system was used. The survey employed smaller sources than traditionally used in the region. A 900 in3 generator–injector airgun array was used offshore while a single Vibroseis unit was used on land. This paper shares the lessons learnt during the planning, approval and acquisition of the Speculant Seismic Survey with the steps taken to reduce the operation’s footprint while maintaining data quality.
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Melville-Smith, Roy, Sonia M. Anderton, and Nick Caputi. "Predicting the recreational western rock lobster (Panulirus cygnus) catch in Western Australia." Marine and Freshwater Research 52, no. 8 (2001): 1527. http://dx.doi.org/10.1071/mf01068.
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The number of fishers purchasing recreational rock-lobster licences in Western Australia increased from ~15 000 during 1986–87 to 33 000 during 1998–99. The quantity landed was estimated from mail surveys conducted during this period. The recreational catch of western rock lobster increased from approximately 220 to 630 tonnes, or from 1.8% to 4.8% of the commercial catch. This study has shown that total recreational catches of western rock lobster in Western Australia are correlated with licence usage rates (r2 = 0.81) and puerulus settlement indices at Alkimos, in the southern region of the fishery, 3 to 4 years earlier (r2 = 0.59). A multipleregression analysis using both of these variables (r2 = 0.91) was used to predict future recreational lobster catches. If future usage were to remain at 1998–99 levels, it is predicted that the recreational catch would be 700 t in 1999–2000, 650 t in 2000–01, and 550 t in 2001–02. We attempted to improve predictions by analysing the data according to puerulus settlement and licence usage in the two coastal management regions. The correlation for the southern region (where most of the recreational fishing is concentrated) was marginally better than that for the total fishery (r2 = 0.93), but the correlation was poor for the northern coastal zone (r2 = 0.55), where licence usage has been relatively steady and where the recreational catch has consistently remained at around 98 t per annum over the last decade.
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Babcock, R. C., J. C. Phillips, M. Lourey, and G. Clapin. "Increased density, biomass and egg production in an unfished population of Western Rock Lobster (Panulirus cygnus) at Rottnest Island, Western Australia." Marine and Freshwater Research 58, no. 3 (2007): 286. http://dx.doi.org/10.1071/mf06204.
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Surveys of spiny lobster (Panulirus cygnus) populations in shallow waters surrounding Rottnest Island in Western Australia revealed much higher levels of density, biomass and egg production in no-take than in fished areas. Density of lobsters was ~34 times higher in the sanctuary, and density of lobsters above minimum legal size around 50 times higher than in other areas around the island where recreational fishing is allowed. Mean carapace length (CL), total biomass and egg production of lobsters in the sanctuary zone were significantly higher than in adjacent fished areas. Large individuals (≥100 mm CL), especially large males, were found almost exclusively within the sanctuary. The abundance of mature animals in these shallow waters indicates that not all P. cygnus migrate to deep water and that shallow water habitats may currently be well below carrying capacity in terms of biomass and egg production. If implemented in a systematic way, unfished areas such as the Kingston Reefs could also provide a useful fisheries-independent tool for assessing trophic interactions and the structure and density of unfished populations, and for estimating parameters such as growth of larger individuals that may be rare or absent in more widely fished populations.
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McGarvey, Richard, Adrian Linnane, Janet M. Matthews, and Annabel Jones. "Decision rules for quota setting to support spatial management in a lobster (Jasus edwardsii) fishery." ICES Journal of Marine Science 74, no. 2 (October 24, 2016): 588–97. http://dx.doi.org/10.1093/icesjms/fsw177.
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The Northern Zone rock lobster fishery in South Australia is extensive, covering ca. 207 000 km2. Managed under transferable quotas, the majority of the annual total allowable commercial catch (TACC) is taken on eastern inshore grounds, targeting the smaller redder lobsters favoured by Chinese buyers. The confined nature of fishing under the TACC system has led to concerns of localized spatial depletion and suggested a need for spatial management. A regional partition of the TACC was proposed. Formal prescriptive decision-rule tables for setting regional TACCs annually were constructed based on target exploitation rates. A target exploitation rate of 20% historically produced zero average yearly change in biomass and, in previous bioeconomic projection modelling, achieved near-optimal net economic return. Using an age-based fishery assessment model that fits to catch totals by both weight and number landed, conditioning on fishing effort and mean weights-at-age, we estimated harvestable biomass for three regions. The management response was to establish inner and outer subzones where separate TACC decision rules are now adopted. Basing the harvest strategy on a target exploitation rate underlies a simple direct method for constructing decision-rule tables for setting TACC using the indicator of previous year’s catch per unit effort (cpue). In the normal cpue range, a constant target exploitation rate is applied. At lower levels of stock abundance, below a designated upper limit reference point of cpue, the exploitation rates used to assign TACCs are set to decline linearly from the normal target level, reaching zero at a designated lower-limit reference cpue point below which the fishery is closed. At higher levels of cpue, stakeholders agreed to a TACC cap, under which exploitation rate decreases if biomass rises. This case study applies where formal harvest strategy decision rules for quota-based lobster fisheries are considered at finer spatial scales.
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Zeller, D. C., and G. R. Russ. "Population estimates and size structure of Plectropomus leopardus (Pisces : Serranidae) in relation to no-fishing zones: mark-release-resighting and underwater visual census." Marine and Freshwater Research 51, no. 3 (2000): 221. http://dx.doi.org/10.1071/mf99020.
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A mark–release–resighting (MRR) technique was used to estimate population size of the coral trout, Plectropomus leopardus, on coral reefs fringing Lizard Island, Great Barrier Reef, Australia. Fish were captured by hook-and-line fishing, and marked with individual freeze-brand numbers in August 1995. An underwater visual census (UVC) technique was used during September and October 1995 both for resighting of marked fish and to make an independent estimate of fish density and thus population size. The study area was 750 966 m2 . The UVC sampled 154 000 m2 (20.5%) of this area. Six different methods of analysis of MRR gave similar population size estimates (e.g. Petersen 12 873; 95% CI 9989–15 754) extrapolated to the 4.5 million-m2 reef area from datum to 20-m depth around Lizard Island. UVC gave a population size estimate (24 182; 95% CI 21 860–26 504) twice that of MRR. The lower estimate derived from MRR may be the result of tag-induced mortality, or of the relative difficulty in discriminating between marked and unmarked trout by UVC. This is only the second estimate of population size of coral trout on an area of the Great Barrier Reef.
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Ochwada-Doyle, Faith, Kate Stark, Julian Hughes, Jeffery Murphy, Michael Lowry, and Laurie West. "Temporal and regional variation in catch across an extensive coastal recreational fishery: Exploring the utility of survey methods to guide and assess spatio-temporal management initiatives." PLOS ONE 16, no. 7 (July 21, 2021): e0254388. http://dx.doi.org/10.1371/journal.pone.0254388.
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As global research into recreational fishing gains momentum due to the pursuit’s biological, social and economic impacts, information on regional and temporal patterns of recreational exploitation will continue to enable objective assessment and development of management initiatives for exploited species. This paper demonstrates the utility of offsite survey methods in assessing spatial and temporal differences in recorded catches from a large, diffuse and heterogenous coastal recreational fishery. Using the estuarine recreational fishery that operates along the coast of New South Wales, Australia as a case study, survey data was employed to quantify annual (June 2013-May 2014) state-wide estuarine catch. Generalized linear mixed effects models were then applied to expanded catch estimates from surveyed households to examine the influence of zone and season on the kept and released numbers of snapper (Pagrus auratus), dusky flathead (Platycephalus fuscus) and bream (Acanthopagrus spp. complex comprised of A. butcheri, A. australis and their hybrids). For kept bream, significant differential seasonal effects were observed in all regions except the Mid-South Coast. For released bream, numbers were greatest in Sydney and during Summer and Winter. For kept snapper, the greatest harvest was recorded in the Mid-South Coast but season had no effect. Differential seasonal effects were found in each zone for released snapper. For kept dusky flathead, the greatest numbers were recorded in Sydney and the Mid-South Coast but season had no effect. We conclude by assessing some current spatial and temporal management initiatives in light of the uncovered patterns of recreational catch and consider the implications of these patterns in terms of future ecosystem-based management recommendations aimed at achieving ecological, social and economic sustainability in fisheries.
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WILLIAMSON, D. H., G. R. RUSS, and A. M. AYLING. "No-take marine reserves increase abundance and biomass of reef fish on inshore fringing reefs of the Great Barrier Reef." Environmental Conservation 31, no. 2 (June 2004): 149–59. http://dx.doi.org/10.1017/s0376892904001262.
Full textAbstract:
The application of no-take marine reserve status to an area is expected to increase abundance and average size of individuals of species targeted by fisheries. The majority of the evidence supporting such expectations still involves comparisons of abundance at the one time of sites with and without marine reserve protection. Very few studies have data on the abundance and size structure of species targeted by fisheries in an area before reserve status is applied. Quantitative estimates of density and biomass of coral trout, Plectropomus spp., the major target of the hook and line fisheries on the Great Barrier Reef (GBR), Australia, on inshore fringing reefs of the Palm and Whitsunday Island groups, central GBR, are provided for 3–4 years before (1983–1984), and 12–13 years after (1999–2000) the establishment of no-take reserves in 1987. Quantitative estimates of density and biomass of coral trout in areas open to fishing were also collected in 1999–2000 at these two island groups. Density and biomass of coral trout increased significantly (by factors of 5.9 and 6.3 in the Palm Islands, and 4.0 and 6.2 in the Whitsunday Islands) in the reserve sites, but not the fished sites, between 1983–1984 and 1999–2000. In 1999–2000, density and biomass of coral trout and a secondary target of the fisheries, Lutjanus carponotatus, were significantly higher in the protected zones than in the fished zones at both island groups. The density and biomass of non-target fish species (Labridae, Siganidae and Chaetodontidae) did not differ significantly between reserve and fished zones at either island group. This is the most convincing data to date that the management zoning of the world's largest marine park has been effective, at least for coral trout on inshore reefs.
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Rowling, KR. "Changes in the stock composition and abundance of spawning Gemfish Rexea solandri (Cuvier), Genpylidae, in South-eastern Australian waters." Marine and Freshwater Research 41, no. 1 (1990): 145. http://dx.doi.org/10.1071/mf9900145.
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Data collected during a study of the New South Wales trawl fishery showed a marked increase in landings of gemfish Rexea solandri (Gempylidae) during the late 1970s, which was due to the exploitation of winter spawning aggregations. Catches peaked at 5100 t in 1980, but declined to about 3000 t over the following few years, rising again to around 4000 t in 1987. Daily landings data for individual vessels were analysed for the period 1973-86. Fishing effort (target days) was standardized by comparison of each vessel's catch per target day with that of an arbitrary standard vessel. Catch per standard day declined by about 70% between 1980 and 1983. The mean caudal fork length of gemfish from spawning run catches declined from 79 cm to 71 cm over the period 1975-85, reflecting a reduction in the number of large fish in the catch and the recruitment of smaller fish into the spawning aggregations. Ages of gemfish were estimated from counts of hyaline zones on the sagittal otoliths. For age classes 1 to 3, otolith-determined ages were validated by means of modal analysis of monthly length-frequency data, but no validation was possible for the older age classes. Males sampled from spawning-run catches were estimated to be predominantly 4-8 years of age, with a maximum age of 11, whereas females were estimated to be predominantly 5-10 years old, reaching a maximum age of 16. For each sex, the proportion of older fish in the catch declined between 1980 and 1986, and there was a corresponding increase in the prominence of newly recruited age classes. It was concluded that there had been a substantial decline in the relative abundance of spawning gemfish, and that significant changes had also occurred in the size and age composition of the stock, consistent with the effects expected to result from exploitation.
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Ryan, Tim E., and Rudy J. Kloser. "Improved estimates of orange roughy biomass using an acoustic-optical system in commercial trawlnets." ICES Journal of Marine Science 73, no. 8 (March 17, 2016): 2112–24. http://dx.doi.org/10.1093/icesjms/fsw009.
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Abstract Echo integration is a well-established method for estimating fish biomass, but is challenging for a low target strength (TS), deep-living fish species such as orange roughy (Hoplostethus atlanticus). A novel approach has been to utilize the infrastructure of the fishing vessel's trawlnet by attaching an acoustic-optical system (AOS) to the net's headline. Deep deployment of the AOS via the trawlnet reduces uncertainties associated with hull-mounted acoustics that include the influence of weather on data quality, low resolution due to the long range to target, large acoustic dead zone on sloping seabed, and inability to identify and differentiate other fish that co-occur with the target species. The AOS system simultaneously records acoustic data at multiple frequencies (38 and 120 kHz), species composition in video and stereo imagery, and environmental data as the net collects biological samples and/or commercial catch. All data streams were considered in a multiple-lines-of-evidence approach to give improved estimates of orange roughy biomass with low error due to species uncertainty. AOS-based biomass estimates, made over a 5-year period from 11 key spawning locations in Australia and New Zealand, showed a strong correlation (r2 = 0.97, n = 39) between frequencies (38 and 120 kHz); the 38 kHz estimates were, on average, 8% higher than 120 kHz, with a standard deviation of 20%. This similarity in estimates across frequencies improves confidence in results compared with single-frequency surveys that are potentially prone to large errors resulting from unknown (mixed) species composition and target strengths, calibration, and sound absorption uncertainties.
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Momigliano, Paolo, and Vanessa Flora Jaiteh. "First records of the grey nurse shark Carcharias taurus (Lamniformes: Odontaspididae) from oceanic coral reefs in the Timor Sea." Marine Biodiversity Records 8 (2015). http://dx.doi.org/10.1017/s1755267215000354.
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The threatened grey nurse shark (Carcharias taurus) is reported for the first time from oceanic coral reefs in the Timor Sea. Generally known from temperate and subtropical coastal reef habitats, this species was encountered by Indonesian traditional fishers on oceanic coral reefs in an area of the Australian Exclusive Economic Zone known as the 1974 MoU Box, some 200 km from the Australian mainland. The presence ofC. tauruson these remote tropical reefs bears important management implications, including the species’ protected status in Australian waters and the challenges of regulating catches in areas permitted for traditional Indonesian fishing.
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Haris, K., Rudy J. Kloser, Tim E. Ryan, Ryan A. Downie, Gordon Keith, and Amy W. Nau. "Sounding out life in the deep using acoustic data from ships of opportunity." Scientific Data 8, no. 1 (January 20, 2021). http://dx.doi.org/10.1038/s41597-020-00785-8.
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AbstractShedding light on the distribution and ecosystem function of mesopelagic communities in the twilight zone (~200–1000 m depth) of global oceans can bridge the gap in estimates of species biomass, trophic linkages, and carbon sequestration role. Ocean basin-scale bioacoustic data from ships of opportunity programs are increasingly improving this situation by providing spatio-temporal calibrated acoustic snapshots of mesopelagic communities that can mutually complement established global ecosystem, carbon, and biogeochemical models. This data descriptor provides an overview of such bioacoustic data from Australia’s Integrated Marine Observing System (IMOS) Ships of Opportunity (SOOP) Bioacoustics sub-Facility. Until 30 September 2020, more than 600,000 km of data from 22 platforms were processed and made available to a publicly accessible Australian Ocean Data Network (AODN) Portal. Approximately 67% of total data holdings were collected by 13 commercial fishing vessels, fostering collaborations between researchers and ocean industry. IMOS Bioacoustics sub-Facility offers the prospect of acquiring new data, improved insights, and delving into new research challenges for investigating status and trend of mesopelagic ecosystems.
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"Solar Pond Performance Enhances Nonconventional Water Resource Availability." International Journal of Engineering and Advanced Technology 9, no. 4 (April 30, 2020): 1043–47. http://dx.doi.org/10.35940/ijeat.d7807.049420.
Full textAbstract:
In the context of utilizing solar ponds, this research was commenced to enhance their performance so as to rely on them as a nonconventional water resources. Primarily, literature was reviewed in the field of solar ponds. The technique can be used to develop the energy needed for pumping, lifting, collecting or treating water. The agricultural sector users claim that water and energy face problems of environmental degradation due to resources scarcity. This research paper, data was gathered and analyzed, in terms of solar pond parameters such as depth of the upper gradient, shading effect, storage zones, daylight hours, ground temperature and covered insulation for different climate zones so as for different latitudes. The analyzed results indicated that solar ponds possess high potential in arid and semi-arid climates similar to Fayoum governorate, where it is distinguished by its ability to collect heat which can be utilized in different applications. The application cover desalination, electric power generation, salt purification, food and fishing industries. The solar pond technique utilized in many countries to act as the backbone for sustainable development in arid and semi-arid zones such as Victoria desert in Australia.