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2002). The recent application of dual-frequency identification sonar (DIDSON; Sound Metrics Corp.) to fisheries research has proven to be an effective tool for quantifying fish abundance, size, behaviour and habitat ... 2.2.5. Quantifying screen contact.
2007, 2008) have been documented using this technique. Data on the localised movements of sharks can inform management agencies and help determine spatial and temporal fishing closures and/or marine protected ... areas to assist with the conservation of
iv Summary. EXECUTIVE SUMMARY. Aerial surveys are a recognised technique to identify the presence and abundance of marine animals. ... 2009). Although not affected by vegetation cover, aerial sighting rates of marine animals are influenced by
due to physical constrains (depth, sediment type, seagrass beds, protected areas) or interference with existing activities or planned developments (navigation channels, anchorages, marinas). ... A total of 295 fish were captured, resulting in the
Assessment of a Dual-frequency Identification Sonar (DIDSON). for application in fish migration studies. ... No. 84. ISSN 1449-9967. Assessment of a Dual-frequency Identification Sonar (DIDSON).
Assessment of fish communities identified some significant differences between lowland areas (< 200 m altitude), slopes areas (201-400m altitude), upland areas (401m – 700 m altitude) and highland areas (> 700m altitude). ... on pygmy perch species is
5.4.1 Challenge tests with Vibrio isolates. In June 1996, bacteriological plating of rearing water and of diseased larvae on marine agar and Harris media was used to isolate three ... and Japan (Nogami and Maeda) to be effective in combating vibriosis in
Map of coastline showing main school whiting trawl ground.11 Figure 3.1. ... Length distributions of total ocean jackets from Experiment 1.42 Figure 4.16.
her es have adopted a more controlled appro odu tion of fish into conservation areas, or to prevent overstocking, both of which can have. ... Finclipping enables identification of age and growth when fish are trapped in the spawning b.
Error bars represent one standard error. 90. Figure 61 Total catch numbers (kept and released), harvest numbers (kept), and proportion (%) of the total catch released for key marine species, by residents ... West et al. NSW/ACT Recreational Fishing