Evidence of large-scale spatial declines in recruitment patterns of southern rock lobster Jasus edwardsii, across south-eastern Australia

Linnane, Adrian; Gardner, Caleb; Hobday, David K.; Punt, André E.; McGarvey, Richard; Feenstra, J.; Matthews, Janet; Green, Bridget

doi:10.1016/j.fishres.2010.04.001

Cited by 64 publications

(42 citation statements)

References 30 publications

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“…Experiments on cultured phyllosomas have indicated that their prey density and temperature are key determinants for their healthy development (Tong et al 2000;Liddy et al 2004). Understanding how environmental factors affect phyllosoma health is crucial, because declining numbers of settling postlarvae has recently been described in the three largest populations of spiny lobsters in the world, causing concern for the major fisheries that they support (Ehrhardt and Fitchett 2010;Linnane et al 2010;Feng et al 2011). The most dramatic decline has been observed in the world's second-largest spiny lobster fishery, that is for the Western Australian spiny lobster, Panulirus cygnus (Brown 2011).…”

Section: Introductionmentioning

confidence: 99%

Condition of larvae of western rock lobster (Panulirus cygnus) in cyclonic and anticyclonic eddies of the Leeuwin Current off Western Australia

Wang

O’Rorke

Waite

et al. 2015

Mar. Freshwater Res.

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Abstract. Changes in the offshore oceanographic processes are suspected to be the cause of a recent dramatic decline in the settlement of post-larvae of the Western Australian spiny lobster (Panulirus cygnus), which has greatly reduced the productivity from the world's second-largest spiny lobster fishery. The present study assessed whether there are differences in the nutritional condition of the larvae of P. cygnus sampled from two pairs of cyclonic eddies (CEs) and anticyclonic eddies (AEs). Morphometric and biochemical analyses were undertaken on the mid-late-stage larvae (VI, VII, VIII) sampled offshore from two pairs of adjacent counter-rotating mesoscale eddies in the Leeuwin Current off Western Australia. The results showed that larvae captured from CEs had greater average total dry mass (P , 0.001) than those from AEs. Stage VIII larvae from CEs contained more protein (P , 0.008) (38.5% AE 5.4 s.e.) and lipid (P , 0.005) (67.2% AE 12.1) than did those from AEs. The possible causes for these differences are uncertain but may be related to differences in water temperatures in CEs v. AEs influencing the ability of phyllosomas to accumulate nutritional reserves.

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Section: Introductionmentioning

confidence: 99%

Condition of larvae of western rock lobster (Panulirus cygnus) in cyclonic and anticyclonic eddies of the Leeuwin Current off Western Australia

Wang

O’Rorke

Waite

et al. 2015

Mar. Freshwater Res.

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“…The projections assumed no relationship between current egg production and future recruitment, which was appropriate given that projections were limited to 10 years. Any effect of the management scenarios examined would not be observed over this period because of several slow processes involved, including the stock response to new management (.1 year), the duration of egg incubation ( 6 months), larval development (18-24 months), and recruitment to the fishery (minimum of 4 years and more typically 6 years) (Bruce et al, 1999;Linnane et al, 2010).…”

Section: Population Dynamics Model Structurementioning

confidence: 99%

Fewer eggs from larger size limits: counterintuitive outcomes in a spatially heterogeneous fishery

Gardner

Hartmann

Punt

et al. 2014

ICES Journal of Marine Science

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The legal minimum length (LML) of female Southern Rock Lobster (Jasus edwardsii) was reduced in the Tasmanian fishery in 1966 for higher sustainable catches. Originally, the LML was to be reduced in slow growth southern areas only; however, the change was implemented across the entire fishery due to lobbying by commercial fishers. The lower LML has been controversial ever since, including during recent years when low recruitment resulted in a lower total allowable catch (TAC). Fishers argued that this could have been prevented with a higher female LML across the jurisdiction. A length-and sex-based bioeconomic model was used to examine probable outcomes of the larger statewide LML. This model showed that management of egg production would be poorly served by raising the statewide LML because of spatial patterns in the stock and fishery. Catch would be displaced from areas where egg production was already high and into the most depleted areas thus reducing production in areas of greatest concern. Spatial variation in biological parameters can have a profound effect on outcomes of management perceived to be conservative, possibly leading to negative impacts. This risk exists wherever catch is displaced, such as with Marine Protected Areas, spatial TACs and gear restrictions.

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“…Fishing is undertaken from November to May with an annual catch of 1553 t recorded during the 2009/10 season (Linnane et al 2010a). The fishery is divided into two zones, Northern and Southern, which are in turn subdivided into Marine Fishing Areas (MFAs) for stock assessment purposes.…”

Section: Please Scroll Down For Articlementioning

confidence: 99%

The importance of conserving recruitment pulses in rock lobster (Jasus edwardsii) fisheries where puerulus settlement is low or highly sporadic

Linnane

McGarvey

Hoare

et al. 2013

Marine Biology Research

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The commercial fishery for southern rock lobster (Jasus edwardsii) is South Australia's most valuable fishery resource worth in excess of AUS$100 million annually. Over the past decade, recruitment to the fishable biomass has decreased, which has translated to declines in commercial catch rates. In the Northern Zone fishery, catch per unit effort (CPUE) declined from 1.42 kg/potlift in 1999 to 0.67 kg/potlift in 2008, a decrease of 52%. Puerulus monitoring has been undertaken since 1996, with the period from settlement to recruitment estimated at Â4 years. In 2002In , 2005In and 2006, spikes in settlement were recorded, which were predicted to enter the fishery as recruitment pulses in 2006, 2009 and 2010, respectively. Management decisions failed to conserve the 2006 recruitment pulse by setting total allowable commercial catches (TACCs) above actual catch estimates. However, in 2008, a conservative management approach was adopted with the TACC reduced from 470 to 310 t despite 403 t being landed in the 2008 season. In 2009, CPUE increased by 31% to 0.88 kg/potlift while fishing effort decreased by 42%. In 2010, CPUE increased further to 1.07 kg/potlift, the highest since 2000. The study highlights the importance of management decisions that conserve recruitment pulses in order to sustain lobster resources on which fisheries depend.

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Evidence of large-scale spatial declines in recruitment patterns of southern rock lobster Jasus edwardsii, across south-eastern Australia

Cited by 64 publications

References 30 publications

Condition of larvae of western rock lobster (Panulirus cygnus) in cyclonic and anticyclonic eddies of the Leeuwin Current off Western Australia

Condition of larvae of western rock lobster (Panulirus cygnus) in cyclonic and anticyclonic eddies of the Leeuwin Current off Western Australia

Fewer eggs from larger size limits: counterintuitive outcomes in a spatially heterogeneous fishery

The importance of conserving recruitment pulses in rock lobster (Jasus edwardsii) fisheries where puerulus settlement is low or highly sporadic

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