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Developmental changes in foregut functioning of packhorse lobster, Jasus (Sagmariasus) verreauxi (Decapoda : Palinuridae), phyllosoma larvae

journal contribution
posted on 2023-05-16, 15:01 authored by Cox, SL, Johnston, DJ
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.

History

Publication title

Marine and Freshwater Research

Volume

55

Pagination

145-153

ISSN

1323-1650

Department/School

Institute for Marine and Antarctic Studies

Publisher

CSIRO Publishing

Place of publication

Collingwood, Australia

Repository Status

  • Restricted

Socio-economic Objectives

Fisheries - aquaculture not elsewhere classified

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