Diurnal migration and vertical distribution of phyllosoma larvae of the western rock lobster Panulirus cygnus

1979 ◽  
Vol 54 (2) ◽  
pp. 109-124 ◽  
Author(s):  
D. W. Rimmer ◽  
B. F. Phillips
Keyword(s):  
Vertical Distribution ◽  
Rock Lobster ◽  
Phyllosoma Larvae ◽  
Panulirus Cygnus ◽  
Diurnal Migration

Distribution and Dispersal of the Phyllosoma Larvae of the Western rock Lobster, Panulirus cygnus, in the South-eastern Indian Ocean

1979 ◽  
Vol 30 (6) ◽  
pp. 773 ◽  
Author(s):  
BF Phillips ◽  
PA Brown ◽  
DW Rimmer ◽  
DD Reid
Keyword(s):  
Indian Ocean ◽  
Continental Shelf ◽  
Average Length ◽  
Eastern Indian Ocean ◽  
Rock Lobster ◽  
The South ◽  
South Eastern ◽  
Phyllosoma Larvae ◽  
Panulirus Cygnus ◽  
One Year

Data on the phyllosoma larvae of P. cygnus caught on seven cruises carried out between April 1976 and January 1977 off the west coast of Australia are presented and discussed. The studies were undertaken to determine the length of the plankton cycle, the distribution of the phyllosoma in the south-eastern Indian Ocean and the extent of the offshore dispersal. Analyses showed the average length of the planktonic life to be less than one year and probably between 9 and 11 months. After hatching most early phyllosoma were transported offshore. Few larvae remained on or near the continental shelf. The maximum westward extent of the phyllosoma distribution of P. cygnus was not determined because significant numbers of phyllosoma were still found as far offshore as 99� 001E. (1500 km offshore), the furthest station sampled. The phyllosoma were distributed over an extensive area of the south-eastern Indian Ocean, and there were few stations beyond the continental shelf between 24� 30'S. and 35� 00'S., from 99� 00'E. to 115� 00'E., during midwinter, at which phyllosoma were not caught. The highest densities of mid-and late-stage phyllosoma occurred between 111� 00' E. and 104� 00' E. (between 375 and 1030 km offshore), at 29� 30'S. The area of greatest abundance was due west of the approximate centre of the adult distribution on the coast. The significance of the circulation of the south-eastern Indian Ocean in the transport of the larvae is discussed.

scholarly journals Stocking density and shelter type for the optimal growth and survival of western rock lobster Panulirus cygnus (George)

Aquaculture ◽  
2006 ◽  
Vol 260 (1-4) ◽  
pp. 114-127 ◽  
Author(s):  
Danielle Johnston ◽  
Roy Melville-Smith ◽  
Blair Hendriks ◽  
Greg B. Maguire ◽  
Bruce Phillips
Keyword(s):  
Stocking Density ◽  
Optimal Growth ◽  
Rock Lobster ◽  
Growth And Survival ◽  
Panulirus Cygnus

Spatial and temporal variation in lipid and fatty acid profiles of western rock lobster pueruli at first settlement: biochemical indicators of diet and nutritional status

2009 ◽  
Vol 60 (8) ◽  
pp. 810 ◽  
Author(s):  
A. J. Limbourn ◽  
R. C. Babcock ◽  
D. J. Johnston ◽  
P. D. Nichols ◽  
B. Knott
Keyword(s):  
Fatty Acid ◽  
Nutritional Status ◽  
Spatial And Temporal Variation ◽  
Lipid Levels ◽  
Rock Lobster ◽  
Important Species ◽  
Fa Composition ◽  
Lipid Fatty Acid ◽  
Spatial And Seasonal Variation ◽  
Panulirus Cygnus

Rock lobster species are found worldwide and have a life history that includes development through a planktonic phyllosoma followed by a nektonic non-feeding puerulus that relies on stored energy during recruitment into near-shore habitats. Recruitment to adult populations of western rock lobster (Panulirus cygnus) is highly variable and is likely to be strongly influenced by shelf width and oceanic conditions affecting cross-shelf transport and nutrition. Since the nutritional status of newly settled pueruli will reflect the phyllosoma feeding environment and distance swum, we studied levels of lipid, fatty acid (FA) and protein of 422 pueruli and 79 first instar juveniles from four Western Australian locations. Lipid levels generally were inversely related to shelf width but were variable, suggesting pueruli may travel complex trajectories to coastal settlement. Lipid and FA composition of pueruli were consistent with spatial and seasonal variation in Leeuwin Current and coastal productivity regimes. Seasonal differences in FA composition occurred regardless of the year of settlement. Pueruli had lower lipid levels during ENSO years, when recruitment tends to be lower also. Measures of puerulus nutritional status appear to provide valuable insights into the processes underpinning recruitment in Panulirus cygnus and other commercially and ecologically important species.

Feeding activity and the morphology of the digestive tract in stage-I phyllosoma larvae of the rock lobster Jasus edwardsii

1997 ◽  
Vol 48 (1) ◽  
pp. 19 ◽  
Author(s):  
David L. Macmillan ◽  
Shaun L. Sandow ◽  
David M. Wikeley ◽  
Stewart Frusher
Keyword(s):  
Digestive Tract ◽  
Electron Micrographs ◽  
Sea Water ◽  
Feeding Activity ◽  
Petri Dish ◽  
Scanning Electron Micrographs ◽  
Rock Lobster ◽  
Jasus Edwardsii ◽  
Phyllosoma Larvae ◽  
Latris Lineata

First-stage phyllosoma larvae of the rock lobster Jasus edwardsii attached to and fed on larvae of the Tasmanian trumpeter fish, Latris lineata, when the two were placed together in an aerated, through-circulating, sea-water aquarium. Scanning electron micrographs of the mouthparts showed adaptations suitable for scraping and cutting soft substrata. Phyllosomas removed from the fish while feeding had pigment particles from the fish integument throughout their digestive tracts. The behaviour of these phyllosomas, swimming in a Petri dish, was recorded with a microscope and video system. The presence of the pigment particles made it possible to see the lumen of the gut diverticulae and parts of them undergoing regular contractions. Transmission electron micrographs of the gut showed that the parts of the gut that contracted in the video records have well developed muscle bands associated with them. The ultrastructure of the digestive tract is relatively uniform throughout and is lined by cells resembling the undifferentiated (E) cells of other scyllarid and palinurid larvae. Extensive folding of the wall, together with a brush border on the digestive cells, results in a large surface area for absorption. There is no grinding or filtering apparatus in the digestive tract. The behaviour of the phyllosoma, structure of the mouthparts, and ultrastructure of the digestive tract, suggest that the first-stage phyllosoma of J. edwardsii is adapted for removing soft tissue from gelatinous organisms and pumping it around the digestive tract.

Genetic structure of the western rock lobster, Panulirus cygnus, with the benefit of hindsight

1996 ◽  
Vol 47 (7) ◽  
pp. 889 ◽  
Author(s):  
AP Thompson ◽  
JR Hanley ◽  
MS Johnson
Keyword(s):  
Genetic Structure ◽  
Western Australia ◽  
Allozyme Variation ◽  
Genetic Homogeneity ◽  
Latitudinal Variation ◽  
Rock Lobster ◽  
Polymorphic Loci ◽  
Allelic Frequencies ◽  
Genetic Subdivision ◽  
Panulirus Cygnus

Allozyme variation was used to investigate the genetic structure of the western rock lobster, Panulirus cygnus, along the coast of Western Australia. The study involved genetic surveys in 1980 and 1994. The first survey showed strong suggestions of latitudinal variation at two polymorphic loci, EST and GPI, but these suggestions were statistically suspect. With the benefit of hindsight gained from 1980, the 1994 survey was designed to examine more directly the suggestion of latitudinal genetic subdivision in this species. No evidence of genetic subdivision was found at either the EST or the GPI locus. In addition, the average FST value over nine polymorphic loci was a very low 0.0002. The evidence is consistent with current interpretations that P. cygnus is a single, panmictic population. In contrast with this spatial genetic homogeneity, however, there were significant changes in allelic frequencies at the GPI locus between 1980 and 1994, indicating genetic differences among cohorts.

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