Abundance patterns of the toxic phytoplankton in coastal waters of the Balearic Archipelago (NW Mediterranean Sea): a multivariate approach |
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Authors: | Margarita Puigserver Nuria Monerris Josep Pablo Josep Alós Gabriel Moyà |
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Institution: | (1) School of Environmental and Rural Science, University of New England, National Marine Science Centre, P.O. Box 4321, Coffs Harbour, NSW, 2450, Australia;(2) Industry and Investment NSW, Fisheries Conservation Technology Unit, P.O. Box 4321, Coffs Harbour, NSW, 2450, Australia |
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Abstract: | The prevalence of catch-and-release factors known to adversely affect the mortality or physical condition of Australian bass
Macquaria novemaculeata were surveyed across a range of anglers throughout impoundments and rivers in New South Wales. Subsamples of tournament-caught
fish were also monitored in tanks for 1 h after being weighed to quantify immediate mortalities and sublethal physical damage.
Most fish were caught on actively fished artificial baits, and were mouth hooked (96%), which resulted in no immediate mortality
amongst monitored fish and a low frequency of mortality-causing factors in surveys. However, fish that were weighed-in during
tournaments often had fin damage (52% of fish) and/or barotrauma (25% of fish, in impoundments only), and were held in live
wells with poor water-quality. The prevalence of these sublethal effects varied considerably according to the specific seasons,
locations, rules and procedures of each tournament; but could not be reliably attributed to any of the recorded catch-and-release
variables (except for dissolved oxygen, which was significantly influenced by live-well volume). While these results validate
the current release of angled Australian bass as a means of conserving their stocks, the potential for adverse effects could
nevertheless be minimised via simple changes to conventional handling. |
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