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.

Mouthpart and foregut ontogeny in phyllosoma larvae of the spiny lobster Jasus edwardsii (Decapoda: Palinuridae)

2001 ◽  
Vol 52 (8) ◽  
pp. 1375 ◽  
Author(s):  
Danielle J. Johnston ◽  
Arthur Ritar
Keyword(s):  
Larval Development ◽  
Early Stage ◽  
Structural Characteristics ◽  
Spiny Lobster ◽  
Filter Press ◽  
Primary Role ◽  
Formulated Diets ◽  
Jasus Edwardsii ◽  
Phyllosoma Larvae

Mouthpart and foregut structure indicates that Jasus edwardsii phyllosomas ingest soft fleshy foods such as gelatinous zooplankton. Mouthpart morphology changes little during larval development, indicating that ingestive capabilities and external mastication are well developed from an early age. However, the density and complexity of setation and robustness of individual mouthparts increases with age, suggesting a greater capacity to ingest larger prey during development. The foregut consists of a single chamber with a number of well-developed grooves, ridges, and setae but lacking a gastric mill. The primary role of the foregut is mixing, sorting, and filtering particles, preground by the mouthparts. Phyllosomas have been divided into early (stage I–III), mid (IV–V), and late (VI–X) stages based on the development of the filter press and main brushes. Increasing robustness of setation and complexity of the foregut suggest that the texture of prey becomes more muscular (fibrous) with larval development. The results presented here suggest that early-stage phyllosoma would benefit from a diet comprising soft gelatinous items, whereas late-stage phyllosomas are better prepared to deal with larger, fleshy prey. The changes in structural characteristics with age should also serve as a guide in the development of formulated diets.

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

scholarly journals Socioeconomic Status and Route Characteristics in Relation to Children’s Exposure to Air Pollution from Road Traffic While Walking to School in Auckland, New Zealand

2021 ◽  
Vol 18 (9) ◽  
pp. 4996
Author(s):  
Mehrdad Rafiepourgatabi ◽  
Alistair Woodward ◽  
Jennifer A. Salmond ◽  
Kim N. Dirks
Keyword(s):  
Air Pollution ◽  
Socioeconomic Status ◽  
New Zealand ◽  
Road Traffic ◽  
Transport Infrastructure ◽  
Traffic Lights ◽  
Significant Difference ◽  
Walking To School ◽  
Children’S Exposure

Pedestrian exposure to traffic-related air pollution depends on many factors; including the nature of the traffic on nearby roads and the route characteristics. In this study, we investigated the effects of differences in vehicle fleet and transport infrastructure on children’s exposure to traffic-related air pollution during their morning walk to school in Auckland, New Zealand. Five pairs of routes to schools—each including a low and a high socioeconomic status (SES) school—were selected and traversed over 7–8 days for each pair while measuring particle number concentration (PNC) and GPS coordinates. At the same time, a sample of 200 license plates of cars from each school’s neighborhood was captured using videos, and the age of each car was extracted using an online database. Both the mean age of the cars and the percentage of old cars (>14 years) were found to be higher in the low SES areas. However, neither measure of vehicle age was associated with a significant difference in exposure to PNC for pedestrians. Route features including narrow footpaths and a higher density of traffic lights may be associated with higher levels of PNC exposure. These findings provide insight into the role of urban design in promoting healthy commutes to school.

The role of olfaction during mating in the southern temperate spiny lobster Jasus edwardsii

2004 ◽  
Vol 46 (3) ◽  
pp. 311-318 ◽  
Author(s):  
Natalie Raethke ◽  
Alison B. MacDiarmid ◽  
John C. Montgomery
Keyword(s):  
Spiny Lobster ◽  
Jasus Edwardsii
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