Skip to main content

Free Content The morphological development of juvenile western rock lobster Panulirus cygnus George, 1962 (Decapoda, Palinuridae) reared in the laboratory

Download Article:
 Download
(PDF 301.3828125 kb)
 
Abundant information on the biology and ecology of lobster pueruli and juveniles collected in the wild is now available. However, biological aspects of the morphological development of spiny lobsters has not adequately reported. In this study, the growth of juvenile western rock lobsters, Panulirus cygnus, was observed and some morphological changes in the pueruli and juvenile are described. Low mortality was found for juveniles reared individually to the 10th instar, with a low mortality being observed in cases of water quality deterioration. The growth rate was similar to other reported works. Some individuals reached the 10th instar (average CL 28.24 mm) after 222 d of culture. Juveniles went through three phases of coloration during their early development and a light red-brown color was fixed at the 4th instar. The main morphological changes in carapace and appendages are shown in the transition from puelurus to the first instar. The mouthparts of the puerulus are simple, having only a few diminutive spines distributed over their surface. After the molt to the first instar, the mandibles show calcification with the mandibular palp being setose and segmented. Spines and setae are present on the endopods as well as segmentation of the exopods of the three maxillipeds. The process of calcification and setation takes place gradually at each successive molt. The relative position of the antennular and antennal peduncles changed during the juvenile growth. Secondary sexual characters develop before the 10th juvenile instar. Sex differentiation can be determined from the position of the gonopores on female and male sterna on large specimens of the 3rd instar, and in all the 4th instar specimens. As in other reported palinurids species, the pleopods of females and males showed different development from the 4th instar. Female subchelate dactyls of the 5th pereiopods develop in individuals during the 7th to 10th instars.

13 References.

No Supplementary Data.
No Data/Media
No Metrics

Document Type: Research Article

Publication date: 1997-07-01

More about this publication?
  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Terms & Conditions
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more