SCRC: SCRC Abalone Research Forum
People development program: 2014 FRDC International travel award - Ruth Eriksen
Harmful algae pose a serious threat to human health, with significant economic implications for aquaculture and wild-harvest sectors. The IOC Intergovernmental Panel on Harmful Algal Blooms (2013) identified “likely intensification of problems associated with eutrophication and stress on coastal marine ecosystems”. Priorities identified included “developing and enhancing expertise for monitoring purposes”, and ”the pivotal role of taxonomy in scientific research, monitoring and management activities” related to HAB events.
Recent Paralytic Shellfish Toxins (PST) events in Tasmania affected many seafood sectors (wild harvest and aquaculture), resulting in an estimated wider economic loss of $25 million, and on-going risks to trade. Industry and regulators highlighted the need for timely and accurate identification of potentially harmful species, and the value of phytoplankton testing as a cost-effective predictive early-warning tool. Identifying the presence of HAB species typically triggers further levels of testing, and/or active management strategies to reduce risk. The PST Review (FRDC 2012/060) defined international best practice, including access to “technically competent laboratories, and laboratory scientists and taxonomists.” The review specifically identified the IOC training course, and the importance of proficiency testing programs for analysts and laboratories involved in phytoplankton identification and research. Taxonomists need to be familiar with all potentially toxic species, especially in light of changing environmental conditions, and range expansions of marine species.
SafeFish have indicated that contemporary information on IOC standards and protocols are urgently needed to develop standardised methods for counting and identification, and ASQAAC ranked this as the highest priority at its recent meeting (April 2014).
Tactical Research Fund: managing inshore stocks of southern rock lobster for a sustainable fishery
There is clearly a concern in the Tasmanian lobster industry about the status of inshore component of the stock. Catch has declined in a number of areas, despite improvements in catch rates. In the Northeast, catch is at record lows, but CPUE has remained stable, which is a possible indicator of hyper-stability or false stability. The apparent stability in catch rates occurs because aggregations containing a major proportion of the population are fished down, as the fleet moves from one area of good catch rates to the next, resulting in a serial depletion of the aggregations, which is masked by the apparent stability in the fishing block. This can result in a very sudden decline in biomass once the entire block is depleted, posing a serious and immediate risk to the inshore component of the stock. There are two potential sources of this problem. Firstly, the scale of the current assessment model, of eight inshore areas (64m) and three offshore areas (>64m) is not be fine enough to detect localised changes in the CPUE or biomass. Secondly there are changes in fishing practices that have increased effort on inshore stocks, and it is unclear whether the extra effort in these practices is adequately recorded in estimates of CPUE. There has been a recent increase in potting effort, commonly referred to as double night fishing, whereby fishers set and haul their pots twice a night, compared to the standard practice of emptying pots once at dusk and/or once during the day. Currently we have no data on the composition of the catch in double night shots, and what proportion of captured lobsters are handled and released, and in fact what consequence this handling has on the overall health of the fishery.