Effects of light intensity and food density on the growth and survival of early-stage phyllosoma larvae of the rock lobster Jasus edwardsii

1999 ◽  
Vol 50 (2) ◽  
pp. 129 ◽  
Author(s):  
Graeme A. Moss ◽  
Lennard J. Tong ◽  
John Illingworth
Keyword(s):  
Light Intensity ◽  
Prey Density ◽  
Stage I ◽  
Food Density ◽  
Rock Lobster ◽  
Individual Stage ◽  
Growth And Survival ◽  
Brine Shrimps ◽  
Jasus Edwardsii ◽  
Phyllosoma Larvae

Individual Stage I, III and V phyllosomas of the rock lobster Jasus edwardsii were fed daily with a fixed number (2, 4, 8, 12 or 16) of brine shrimps (Artemia salina, 2–3 mm long) under four different continuous light intensities (10, 0.1, 0.001 and ≤0.0002 µmol s-1 m-2) to determine the optimum requirement for growth and survival. Phyllosomas of each stage fed higher rations of brine shrimps had a significantly shorter intermoult period and larger post-moult size. Light intensity had a significant effect on the post-moult size of Stage I phyllosomas but had no effect on the intermoult period. Individual Stage I, III and V phyllosomas were also fed daily with fixed numbers (2, 4 and 8 respectively) of brine shrimps in containers with different volumes (10, 20, 40, 60, 80, 120 and 240 mL) to alter the prey density while maintaining prey numbers. Prey density had no significant effect on intermoult period or post-moult size but did affect consumption rates. The results are discussed in relation to large-scale culture of phyllosoma larvae.

Effect of brine-shrimp numbers on growth and survival of early-stage phyllosoma larvae of the rock lobster Jasus edwardsii

1997 ◽  
Vol 48 (8) ◽  
pp. 935 ◽  
Author(s):  
Lennard J. Tong ◽  
Graeme A. Moss ◽  
Megan M. Paewai ◽  
Timothy D. Pickering
Keyword(s):  
Large Scale ◽  
Early Stage ◽  
Artemia Salina ◽  
Fixed Number ◽  
Rock Lobster ◽  
Growth And Survival ◽  
Brine Shrimps ◽  
Jasus Edwardsii ◽  
Large Scale Culture ◽  
Phyllosoma Larvae

Stages I to VI phyllosoma larvae of the rock lobster Jasus edwardsii were fed daily with a fixed number (1, 2, 4, 8, 12 or 16) of 2–3 mm brine shrimps (Artemia salina) to determine the optimum requirement for growth and survival. For stages I and II the threshold below which food became limiting, measured as a significant delay in moulting, was <2 brine shrimps per day. For stage III the threshold was 4 brine shrimps per day, for stages IV and V it was 8 brine shrimps per day and for stage VI, 12 brine shrimps per day. Growth at the moult was reduced when food was limiting. The feeding rate reduced immediately before the moult and this was most evident for stages V and VI. The results are discussed in relation to large scale culture of phyllosoma larvae.

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.

scholarly journals Lipids and nutrition of the southern rock lobster, Jasus edwardsii, from hatch to puerulus

2001 ◽  
Vol 52 (8) ◽  
pp. 1475 ◽  
Author(s):  
Charles F. Phleger ◽  
Matthew M. Nelson ◽  
Ben D. Mooney ◽  
Peter D. Nichols ◽  
Arthur J. Ritar ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Lipid Class ◽  
Compositional Data ◽  
Dietary Manipulation ◽  
Omega 3 ◽  
Rock Lobster ◽  
Omega 3 Fatty Acid ◽  
Jasus Edwardsii ◽  
Omega 6 ◽  
Phyllosoma Larvae

We examined the lipid class and fatty-acid composition of the southern rock lobster, Jasus edwardsii, phyllosoma larvae and puerulus stage to improve understanding of their nutrition in relation to aquaculture. Lipid is critical in the nutrition of larval crustaceans, including lobsters. Specimens were from Tasmanian waters, Australia, and North Island, New Zealand, waters. Analyses were by TLC-FID and capillary GC and GC-MS. Phyllosoma larvae and nektonic pueruli were low in storage lipid (triacylglycerol), and phospholipid was the major lipid class. Sterol, mainly cholesterol, was the next most abundant class. The ratio of the essential omega-3 fatty acid eicosapentaenoic acid (EPA) to the omega-6 fatty acid arachidonic acid (AA) was lower in newly hatched phyllosomas (1.2–1.3) than in other phyllosomas (stages III–XI; 2.8–6.7) and pueruli (3.8). Ratios of the omega-3 fatty acid DHA (docosahexaenoic acid) to EPA were also lower in newly hatched phyllosomas (0.5) than in laterstage phyllosomas (1.5–2.1) and pueruli (1.2). We have followed up these compositional data by successfully enriching the live diet (Artemia) of early phyllosomas with AA, EPA and DHA. This dietary manipulation has achieved ratios of these key polyunsaturated fatty acids similar to those of wild phyllosomas. These findings will be of significance to the future of rock-lobster aquaculture.

scholarly journals Feeding Artemia and shellfish to phyllosoma larvae of southern rock lobster (Jasus edwardsii)

Aquaculture ◽  
2002 ◽  
Vol 212 (1-4) ◽  
pp. 179-190 ◽  
Author(s):  
Arthur J Ritar ◽  
Craig W Thomas ◽  
Adrian R Beech
Keyword(s):  
Rock Lobster ◽  
Jasus Edwardsii ◽  
Phyllosoma Larvae

Estimating the duration of the pelagic phyllosoma phase of the southern rock lobster, Jasus edwardsii (Hutton)

2015 ◽  
Vol 66 (3) ◽  
pp. 213 ◽  
Author(s):  
R. W. Bradford ◽  
D. Griffin ◽  
B. D. Bruce
Keyword(s):  
Regression Analysis ◽  
Larval Dispersal ◽  
Settlement Patterns ◽  
Rock Lobster ◽  
Planktonic Larva ◽  
New Model ◽  
Larval Stages ◽  
Biophysical Models ◽  
Jasus Edwardsii

The phyllosoma larva of the southern rock lobster, Jasus edwardsii, is thought to be among the longest larval phases of any planktonic larva, with estimates in the literature ranging from 12 to 24 months. In the present study, we have used an extensive archive of samples (over 2800 samples with 680 phyllosoma) to refine the estimate of the duration of the pelagic phase. The distribution through the year of larval stages suggested that larvae from two separate spawning events were present in any 12-month period. Using regression analysis, we have estimated the duration of the phyllosoma phase to be 547±47.5 days (~18.2±1.6 months). A new model of J. edwardsii phyllosoma development is presented and compared with data on known hatching and settlement patterns. The new model will improve the paramiterisation of stage-specific biophysical models of larval dispersal and regional connectivity, to better inform management of the southern rock lobster fisheries.

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