The pattern of growth in the early lifecycle of individual Sepia pharaonis
Jonathan W. MintonThe National Resource Center for Cephalopods, Marine Biomedical Institute, University of Texas Medical Branch, 301 University Blvd, Galveston, TX 77555-1163, USA. Email: jwminton@utmb.edu
Marine and Freshwater Research 55(4) 415-422 https://doi.org/10.1071/MF03204
Submitted: 13 December 2003 Accepted: 23 March 2004 Published: 22 June 2004
Abstract
The pattern of growth in the early lifecycle of the pharaoh cuttlefish, Sepia pharaonis, was investigated by rearing hatchlings at 26°C in two separate trials. In each trial, the mean weight and mantle length (ML) was recorded in 5-day intervals. In addition, in each trial the growth of 20 group-reared cuttlefish was measured as a control to compare against the individual data. After 60 days of growth, the mean size for individuals in trial 1 was 2.75 g (maximum size 3.32 g) and in trial 2 was 12.76 g (maximum size 14.99 g) at 90 days. Each individual went through distinct growth phases during the first 90 days after hatching. The first growth phase matched exponential curves with an R-value of 0.98 or better, and the second growth phase corresponded with linear and power growth curves at an R-value of 0.98 or better. In trial 1, the mean growth rate for individuals during the first phase was 5.91% BW day–1 and the control group growth rate was 6.36% BW day–1. In trial 2, the mean growth rate for individuals during the first phase was 6.06% BW day–1 and the control group growth rate was 6.70% BW day–1.
Extra keywords: cephalopod, culture, cuttlefish, juvenile, plasticity.
Acknowledgments
Special thanks to John Forsythe for his help designing the study and to Leigh Walsh and Paul DiMarco for their advice and support. I would also like to thank Dr Philip Lee and the staff at the National Resource Center for Cephalopods for their assistance during these experiments. I acknowledge the TAMUG students who have worked part-time as field collectors and helped obtain the food necessary for these experiments. I gratefully acknowledge the financial support from the National Institutes of Health, National Center for Research Resources (grant P40 RR01024-23), the Texas Institute of Oceanography and the Marine Medicine General Budget Account of the Marine Biomedical Institute.
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