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Ecosystem effects of fishing closures in mangrove estuaries of tropical Australia

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dc.contributor Australian Institute Of Marine Science
dc.contributor Queensland Department Of Agriculture & Fisheries
dc.contributor University Of Tasmania
dc.contributor Australian Inst Marine Sci
dc.contributor Queensland Dept Primary Ind
dc.contributor Australian Maritime Coll
dc.contributor Australian Institute Of Marine Science (aims) en GRIBBLE, NA LEY, JA HALLIDAY, IA TOBIN, AJ GARRETT, RN 2017-03-21T01:10:26Z 2013-02-28T06:49:15Z 2013-02-28T06:49:15Z 2019-07-08T02:31:24Z 2017-03-21T01:10:26Z 2013-02-28T06:49:15Z 2013-02-28T06:49:15Z 2019-07-08T02:31:24Z 2002-01-01
dc.identifier 6433 en
dc.identifier.citation Ley JA, Halliday I, Tobin AJ, Garrett RN and Gribble NA (2002) Ecosystem effects of fishing closures in mangrove estuaries of tropical Australia. Marine Ecology Progress Series. 245: 223-238. en
dc.identifier.issn 0171-8630
dc.description.abstract Along the section of Australia's coast adjacent to the Great Barrier Reef, certain mangrove-dominated estuaries have been closed to commercial net fishing for over 5 yr. During a 2 yr bimonthly sampling program aimed at evaluating the effect of these closures, fish communities were compared among 3 pairs of neighbouring estuaries (1 closed and 1 open to commercial net fishing per pair). We employed a complete factorial design to test effects of fishing (open or closed), region of the study area along the coast of Queensland (north, middle or south), and position (upstream or downstream). Standardised sets of gill nets (19 to 152 mm stretched mesh) were used, with the largest-mesh research nets (152 mm) comparable to smallest mesh (150 mm) nets permitted for commercial gill net fishing within open estuaries. In comparison with open systems, catch rates in the largest-mesh research nets in closed systems were 3 times greater for total abundance, 3.7 times greater for the main target species barramundi Lates calcarifer (Centropomidae), 4.4 times greater for juvenile sharks Carcharhinus leucas (Carcharhinidae), and 2.9 times greater for queenfish Scomberoides commersonianus (Carangidae). Furthermore, in comparison with open systems, catch rates in 102 mm mesh research nets in closed systems were 2.5 times greater for L. calcarifer, While lower catch rates of target and bycatch species in 152 mm mesh nets could be readily attributed to commercial operations in open systems, reasons for lower catch rates in the 102 mm research nets were less apparent, since gill nets with <150 mm mesh were prohibited within the open estuaries. Reduction in numbers of large barramundi may have had an impact on recruitment of juveniles in the fished estuaries, leading to these lower catch rates in smaller size classes. Despite substantial depletion in numbers of piscivorous predators in fished systems, there was no evidence of impacts on lower trophic levels sampled with the 2 smallest-mesh research nets (51 mm and multipanel 19/25/35 mm mesh). In these estuaries, prey species assemblages were comprised of 92 species, mainly planktivores, scavengers and detritivores. As in coral reef systems, high diversity and productivity in tropical mangrove-dominated estuaries may strengthen the resilience of prey-base communities to disturbances such as fishing. However, since substantially greater abundances of target and bycatch species occurred among replicate mangrove estuaries protected from commercial fishing, our results significantly strengthen the case in favour of the effectiveness of reserves in conserving populations of exploited species.
dc.language English
dc.language en en
dc.relation.ispartof Marine Ecology Progress Series - pages: 245: 223-238 en
dc.relation.ispartof Null
dc.subject Biodiversity
dc.subject Marine Reserves
dc.subject Lates Calcarifer
dc.subject Ecology
dc.subject Trophic Cascade
dc.subject Effects Of Fishing
dc.subject Tropical Estuaries
dc.subject Lates-calcarifer
dc.subject Factorial Design
dc.subject River
dc.subject Fishes
dc.subject Environmental Sciences & Ecology
dc.subject Mangroves
dc.subject Barramundi
dc.subject Food
dc.subject Centromopidae
dc.subject Marine & Freshwater Biology
dc.subject Oceanography
dc.subject Queensland
dc.title Ecosystem effects of fishing closures in mangrove estuaries of tropical Australia
dc.type journal article en
dc.identifier.wos WOS:000180531300021

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