Developmental changes in foregut functioning of packhorse lobster, Jasus (Sagmariasus) verreauxi (Decapoda : Palinuridae), phyllosoma larvae
Serena L. Cox A C and Danielle J. Johnston BA School of Biological Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand.
B School of Aquaculture, Tasmanian Aquaculture and Fisheries Institute, University of Tasmania, Locked Bag 1-370, Launceston, Tas. 7250, Australia.
C Corresponding author. Email: s.cox@auckland.ac.nz
Marine and Freshwater Research 55(2) 145-153 https://doi.org/10.1071/MF03175
Submitted: 23 October 2003 Accepted: 12 December 2003 Published: 31 March 2004
Abstract
The development of foregut structure and digestive function was examined in Jasus (Sagmariasus) verreauxi phyllosomas (instars 1–13) using resin histology and video analysis. Early instar (1–3) phyllosoma had very simple anterior foreguts with little differentiation into ventral and dorsal chambers, no filter press and small lateral comb-row setae. By mid instars (4–7), the filter press had developed and ventral and dorsal chambers of the foregut were distinct. The number and robustness of lateral setae had increased and a dense mat of anterior floor setae had formed. The filter press became increasingly complex in later-instar (8–13) larvae and dense robust lateral comb-row setae, main brushes and a thick mat of anterior floor setae forming longitudinal channels had developed by this stage. The mechanism of food digestion remained similar between instars but changes in foregut structures suggest that the degree of internal mastication, filtration and capacity to sort and mix particles improved with age. This research has implications for artificial diet development in crustacean culture and understanding dietary shifts during larval development.
Extra keywords: artificial diet, crustacean, digestion, foregut structure.
Acknowledgments
The authors wish to thank NIWA (National Institute of Water and Atmospheric Research), Mahanga Bay for provision of larvae, Beryl Davy and Adrian Turner (University of Auckland) for extensive assistance with histological techniques and Martin Lourey for review and critical assessment of the manuscript. Work was funded by a Uniservices Scholarship (University of Auckland), FRST (Foundation for Research Science and Technology, New Zealand) and the Fisheries Research and Development Corporation, Rock Lobster Enhancement and Aquaculture Subprogram (Project PN2000/214) (Tasmania).
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1 See Davie (2002) and Booth and Webber (2001).
