Effects of marine reserve protection on spiny lobster (Jasus edwardsii) abundance and size at Tonga Island Marine Reserve, New Zealand

2002 ◽  
Vol 12 (2) ◽  
pp. 213-227 ◽  
Author(s):  
R.J. Davidson ◽  
E. Villouta ◽  
R.G. Cole ◽  
R.G.F. Barrier
Keyword(s):  
New Zealand ◽  
Marine Reserve ◽  
Spiny Lobster ◽  
Jasus Edwardsii

Healthier lobsters in a marine reserve: effects of fishing on disease incidence in the spiny lobster, Jasus edwardsii

2009 ◽  
Vol 60 (2) ◽  
pp. 140 ◽  
Author(s):  
D. J. Freeman ◽  
A. B. MacDiarmid
Keyword(s):  
New Zealand ◽  
Bacterial Infection ◽  
Marine Protected Areas ◽  
Small Proportion ◽  
Disease Incidence ◽  
Marine Reserve ◽  
Spiny Lobster ◽  
Significant Difference ◽  
Jasus Edwardsii

Comparison of the health of spiny lobsters (Jasus edwardsii) within and adjacent to a New Zealand marine reserve revealed marked differences in the incidence of a handling-related bacterial infection. Lobsters outside the reserve were significantly more affected by tail fan necrosis than lobsters within the reserve, with up to 17% of the males caught outside the reserve over a 3-year period showing signs of tail fan necrosis, compared with less than 2% within the reserve. The incidence of tail fan necrosis changed abruptly at the marine reserve boundaries, strongly implying repeated handling as the causal agent. The incidence of tail fan necrosis in males increased up to the minimum legal size, consistent with a handling effect. Female lobsters, which comprise only a small proportion of the catch in this area, were comparatively unaffected by tail fan necrosis. There was no significant difference in the recapture rates of individuals tagged either with or without tail fan necrosis, but tagged individuals outside the reserve were more likely to develop tail fan necrosis than tagged individuals within the reserve. These findings have implications for both the dynamics of the lobster populations and their management, and highlight the role of marine protected areas in providing a baseline against which such effects of fishing can be assessed.

Sea-cage culture of the spiny lobster Jasus edwardsii in New Zealand

2001 ◽  
Vol 52 (8) ◽  
pp. 1419 ◽  
Author(s):  
Andrew G. Jeffs ◽  
Phil James
Keyword(s):  
New Zealand ◽  
Spiny Lobster ◽  
Careful Selection ◽  
Cage Culture ◽  
Culture Experiment ◽  
Northern Site ◽  
Jasus Edwardsii ◽  
Wet Weight ◽  
Sea Cage ◽  
Selection Of

The potential for using suspended sea cages for the aquaculture of juvenile spiny lobsters was assessed for Jasus edwardsii in New Zealand. Lobsters were grown for a year in sea cages at three sites starting from pueruli and regularly fed on opened mussels. Larger juvenile lobsters of two size classes were also held in sea cages with small live mussels for food. Pueruli grew at rates that were close to or greater than those previously recorded from tank experiments. At the most northern site, lobsters grew most quickly to an average of 42.1 mm CL 0.4 s.e. and 36.9 g wet weight 1.0 s.e. in a year. The mortality of lobsters differed with site, but at one site was lower (14%) than was recorded in a previous tank-culture experiment (25%). The differences in growth and mortality among sites appear to be related to differences in ambient water temperatures. Larger juvenile lobsters were found to be unable to feed on the small live mussels. These results indicate that suspended sea-cage culture has considerable potential for the aquaculture of spiny lobster juveniles but will require the careful selection of sites and the development of effective feeding arrangements.

Swimming energetics of the postlarvae of the spiny lobster Jasus edwardsii in New Zealand

2018 ◽  
Vol 94 (3) ◽  
pp. 821-833 ◽  
Author(s):  
Luvia Lorei García-Echauri ◽  
Andrew Jeffs
Keyword(s):  
New Zealand ◽  
Spiny Lobster ◽  
Jasus Edwardsii

Use of a marine reserve to determine the direct and indirect effects of fishing on growth in a New Zealand fishery for the spiny lobster Jasus edwardsii

2012 ◽  
Vol 69 (5) ◽  
pp. 894-905 ◽  
Author(s):  
Debbie J. Freeman ◽  
Paul A. Breen ◽  
Alison B. MacDiarmid
Keyword(s):  
Growth Rates ◽  
Marine Reserve ◽  
Spiny Lobster ◽  
Catch Per Unit Effort ◽  
Density Dependent ◽  
Time Period ◽  
Jasus Edwardsii ◽  
Negative Effect ◽  
Similar Growth ◽  
Positive Effect

The effects of fishing on growth in a spiny lobster, Jasus edwardsii , were explored by using a no-take marine reserve as a control for these effects. We analysed data from lobster tag–recapture studies outside the reserve from 1975 until the present and tag–recapture from inside the reserve during a recent 8-year study. We explored whether recent and historical data showed similar growth and, using catch per unit effort (CPUE) data from research potting and commercial returns, whether growth rates in this lobster species were affected by population density. Despite the confounded nature of the data, recent growth rates appeared to be lower than in earlier years, growth appeared weakly density-dependent, and the reserve appeared to have a positive effect on lobster growth. The strongest effect was the time period, but the density-dependent and reserve effects appeared real. The reserve effect suggests a negative effect of handling of sublegal-sized lobsters on growth.

Distribution and condition of pueruli of the spiny lobster Jasus edwardsii offshore from north-east New Zealand

2001 ◽  
Vol 52 (8) ◽  
pp. 1211 ◽  
Author(s):  
Andrew G. Jeffs ◽  
Stephen M. Chiswell ◽  
John D. Booth
Keyword(s):  
New Zealand ◽  
Developmental Process ◽  
Spiny Lobster ◽  
Total Lipid Content ◽  
Offshore Water ◽  
North East ◽  
The North ◽  
Jasus Edwardsii ◽  
Phyllosoma Larvae ◽  
Exogenous Trigger

Pelagic spiny lobster, Jasus edwardsii, pueruli and phyllosomas were sampled on offshore transects from the south-east coast of the North Island of New Zealand in February 1998. Carapace length, weight, and total lipid content of pueruli (n = 360) were assessed; 33 pueruli had soft carapaces, indicative of recent metamorphosis from final-stage (stage 11) phyllosoma larvae. The recently metamorphosed pueruli occurred 24–216 km offshore, much farther offshore than has been previously suggested for the location of metamorphosis. Their distribution was compared to information on their size and condition, as well as their distance offshore, water depth, temperature and salinity, and estimates of phytoplankton biomass. The results indicate that a threshold of larval energy reserve is unlikely to trigger metamorphosis, but rather some exogenous trigger may be involved, or metamorphosis may be part of a programmed developmental process. The distribution and condition of the new pueruli suggest that about 84% had the energetic capacity to swim inshore to settle. This result may have important implications for patterns of puerulus settlement and subsequent recruitment of lobsters to coastal populations and their important associated fisheries. It may influence both the seasonal and interannual variability in settlement observed in this species.

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