title: Spatial Variability in Condition of Southern Rock Lobsters (Jasus edwardsii) at the Start of the Tasmanian Fishing Season.
abstract: The southern rock lobster (Jasus edwardsii) industry in Australia favours red lobsters, which are usually caught in shallow waters, over paler (brindle) lobsters. This preference is driven partly by the Chinese market, where red is associated with luck and prosperity, and additionally, by the widely held perception within the industry that brindles have greater mortality rates during out of water transport than reds. Limited scientific evidence supports these industry observations; however, these studies did not evaluate the initial condition of lobsters. This study aimed first, to determine which variables better describe condition in J. edwardsii and second, to compare condition among lobsters in several sites around Tasmania at the typical time of high transport mortality. Male lobsters were collected from the South West, South East, East and North coast of Tasmania in late November/December 2014, which correspond to the start of the Tasmanian fishing season. A comprehensive condition assessment was applied by measuring tissue proximal composition, Brix index, Total Haemocyte Count, pH, haemocyanin and another 16 haemolymph parameters of interest. A useful framework to compare condition in J. edwardsii was established by first, using Brix index as a measure of nutritional condition, second, using pH, magnesium, and bicarbonate to evaluate differences in physiological condition and finally, using THC counts as a proxy for lobster health condition. Lobsters from different sites had different nutritional, physiological and health condition, consistent with industry observations, however our results indicate that some red shallow water lobsters exhibited poorer nutritional and health condition, while some deep water brindle lobsters were in good condition. Differences in condition could not be directly associated to catch depth of lobsters and was related to other spatially discrete factors which sometimes vary over distances <3 km.
authors.affiliation: Institute for Marine and Antarctic Studies, Fisheries and Aquaculture Centre, University of Tasmania, Private Bag 49, Hobart 7001, Australia.
authors.forename: Tania
authors.identifier: http://orcid.org/0000-0003-4397-2064
authors.initials: T
authors.lastname: Mendo
authors.affiliation: Institute for Marine and Antarctic Studies, Fisheries and Aquaculture Centre, University of Tasmania, Private Bag 49, Hobart 7001, Australia.
authors.forename: Cedric
authors.initials: C
authors.lastname: Simon
authors.affiliation: Institute for Marine and Antarctic Studies, Fisheries and Aquaculture Centre, University of Tasmania, Private Bag 49, Hobart 7001, Australia.
authors.forename: Bridget
authors.initials: B
authors.lastname: Green
authors.affiliation: Institute for Marine and Antarctic Studies, Fisheries and Aquaculture Centre, University of Tasmania, Private Bag 49, Hobart 7001, Australia.
authors.forename: Caleb
authors.initials: C
authors.lastname: Gardner
mesh_terms: D053180:Animal Nutrition Sciences / Q000379:methods*; D000818:Animals; D001315:Australia; D005398:Fisheries; D006433:Hemocyanins / Q000378:metabolism; D006458:Hemolymph / Q000378:metabolism; D008297:Male; D033521:Palinuridae / Q000378:metabolism / Q000502:physiology*; D012621:Seasons; D013648:Tasmania
chemical_list: D006433:Hemocyanins