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.

II.—Note on the Recent Volcanic Eruption in New Zealand

1886 ◽  
Vol 3 (9) ◽  
pp. 398-402
Keyword(s):  
New Zealand ◽  
Early Morning ◽  
Considerable Change ◽  
Lake District ◽  
Historic Period ◽  
North East ◽  
The North ◽  
The One ◽  
Wide Zone ◽  
White Island

The “Lake District” of the North Island is too well known to all students of volcanic phenomena, especially of that branch comprising hydrothermal action, to need a detailed description. It will be sufficient to say that it forms a belt, crossing the island from north-east to south-west, and forms a portion of the Middle and Upper Waikato Basins of Hochstetter. The district has been recently brought into prominent notice by the disastrous eruption of Mount Tarawera, very full accounts of which have appeared in New Zealand papers lately received. The eruption commenced in the early morning of Thursday, June 10th, but premonitory symptoms showed themselves a few days before in a tidal wave, three feet high, on Lake Tarawera, great uneasiness of the springs at Ohinemutu, and the reported appearance of smoke issuing from Euapehu, the highest of the great trachytic cones at the extreme south-westerly end of the system. The belt of activity extends from Mount Tongariro at the one end to White Island, in the Bay of Plenty, at the other, a distance of about 150 miles. White Island has undergone considerable change from volcanic action during recent years, and Tongariro was last in eruption in July, 1871; whilst its snowclad sister cone Euapehu has never manifested volcanic action within the historic period until now. This wide zone in the centre of the North Island has, ever since the arrival of the Maoris, been the scene of such extraordinary phenomena, that it has of late been the resort of visitors from all quarters of the globe.

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

Wairakite, the calcium analogue of analcime, a new zeolite mineral

1955 ◽  
Vol 30 (230) ◽  
pp. 691-698 ◽  
Author(s):  
A. Steiner
Keyword(s):  
New Zealand ◽  
Hydrothermal Alteration ◽  
New Mineral ◽  
X Ray ◽  
X Ray Crystallography ◽  
Volcanic Region ◽  
North East ◽  
The North

During the study of hydrothermal alteration of cores recovered Dfrom holes drilled at Wairakei during the exploration for geothermal steam, an unusual zeolite mineral was found. Optical, chemical, and X-ray data indicate that this zeolite is a new mineral, the calcium analogue of analcime. The name wairakite is given to the new mineral after the locality Wairakei in New Zealand. Wairakei is situated in the central part of the North Island, approximately 4 miles north-north-east from Lake Taupo, in an active volcanic region. The material was submitted to Dr. D. S. Coombs, Department of Geology, University of Otago, Dunedin, for an investigation of its X-ray crystallography.

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