https://ogma.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39544 60 % of the biomass was required to obtain an accurate estimate of abundance for rarer species. The careful consideration of program objectives is important in optimising the sampling approach employed, as subsampling may not be appropriate for detection of rare species. The patterns presented here provide a quantitative basis to support sampling and sorting methodology for multispecies trawl samples, as well quantifying the implications of subsampling on the confidence in estimates of diversity or abundance.]]> Wed 27 Jul 2022 14:25:17 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52172 Wed 04 Oct 2023 10:55:46 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46339 Penaeus [Melicertus] plebejus; EKP, an important penaeid species harvested across eastern Australia) that are closed to trawling (on a permanent, and temporary basis) were evaluated using a combination of trawl and tag-recapture surveys. Over 1,250 EKP were tagged and released across the permanent and temporary trawl closure, and 15.4% of all tagged prawns were recaptured and reported by fishers in both New South Wales (33% of recaptures) and the adjacent jurisdiction of Queensland (67% of recaptures, up to 730 km from the point of tagging) during 7 months post-tagging. There were significant differences in prawn size and abundance across the permanent and temporary trawl closure areas with both depth and distance to the adjacent estuarine nursery explaining these patterns, but prawns generally exceeded the minimum size-at-first-capture estimated by relevant yield per recruit models before they left areas closed to trawling. While more prawns were captured in Queensland, recapture rates were far greater in New South Wales when standardised by relative effort. Patterns in these data highlight the broader considerations of spatial management in multi-jurisdictional fisheries.]]> Tue 15 Nov 2022 13:51:54 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43117 Tue 13 Sep 2022 14:25:26 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:37663 Tue 09 Mar 2021 18:06:03 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39925 Thu 30 Jun 2022 12:02:32 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51216 Thu 24 Aug 2023 15:06:05 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:30702 Metapenaeus macleayi) and Mud Crab (Scylla serrata), two commercially important crustaceans in Australia. Perfluorooctane sulfonate (PFOS), perfluorohexane sulfonate (PFHxS), and perfluorooctanoic acid (PFOA) were present in samples of both species collected following exposure under natural conditions in contaminated estuaries. Depuration was tested in uncontaminated water for 33 days. PFOA was present at levels close to LOR in both species, and was not detected after 4.5 h and 72 h in School Prawn and Mud Crab respectively. PFHxS was rapidly depurated by School Prawn, and had a depuration half-life of 5.7 h. PFOS was also depurated by School Prawn, with a depuration half-life of 158.5 h. PFHxS and PFOS concentrations were highly variable in Mud Crab both at the start, and during the depuration experiment, and a depuration model could not be fitted to the data. For School Prawn, depuration of total PFASs to the relevant screening value for protection of human health (9.1 μg kg^{− 1}) occurred within 7.1 h. Rapid depuration of PFASs in School Prawn indicates that human health risks associated with consumption may decrease as this species migrates away from the contamination source. Further research is required to better understand the relationships between contaminant load and life-history characteristics (such as growth, reproduction, and moult cycle) in Mud Crab, and future work should target broader time frames for depuration in this species.]]> Sat 24 Mar 2018 07:35:08 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46212 Penaeus (Melicertus) plebejus; EKP) as a case study, we examine how spatial and temporal factors can influence connectivity between a spatial management network designed to protect small prawns from capture by trawlers, and a multi-jurisdictional (Queensland [Qld] and New South Wales [NSW]) fishery. Over 7500 prawns were tagged across multiple years in three northern NSW spatial management areas, and 786 tagged prawns were recaptured across both jurisdictions. The majority of prawns tended to be recaptured from deeper waters adjacent to, or directly north of, the spatial management areas, but tagging location and release timing influenced recapture patterns. Cohorts tagged early in the growth season showed lower recapture rates, but were larger on average at recapture, and had migrated further. Prawns reached the fishery in the adjacent jurisdiction (Qld) within 54 days-post tagging, but for most cohorts the majority of recaptures were in NSW zones. Overall, there was good connectivity between all spatial management areas and the NSW fishery, and tagged prawns also reached the Qld spawning areas. This represents an optimal scenario for NSW fishers (who forgo capture of prawns within these spatial management areas): the prawns protected in the closure areas primarily contribute to harvest of larger sized prawns within NSW waters; and a portion of the protected prawns survive to reach the southern Queensland spawning grounds, which is the primary source of recruits for northern NSW nurseries. These findings are broadly relevant to defining the role and impact of established and proposed spatial management networks within penaeid fisheries.]]> Mon 14 Nov 2022 15:47:10 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51083 Fri 18 Aug 2023 09:38:16 AEST ]]>