Changes in gut evacuation time of larval mud crab, Scylla serrata (Crustacea: Portunidae) fed artificial plankton or live food
Journal Title: Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society - Year 2012, Vol 5, Issue 4
Abstract
To understand the feeding and digestive strategies of Scylla serrata larva and juvenile at various stages, gut evacuation time (GET) at different developmental stage were determined in the present study. GET in larval S. serrata ranged from 80 min in early zoeal stages to about 120–135 min in megalopa and crab first instar stages. GET differed significantly between stages and between diet but the interaction of stage and diet was not significant. GET for the artificial food is significantly longer than that for the live food. Movement of both the artificial (AF) and live food (LF) along the gut were traced from the hepatopancreas (HP) to the 2nd, 3rd, 4th and 5th abdominal segments (A.S.), midgut (MG), hindgut (HG), near telson and during evacuation. There were very slight differences between the movement of both food at Z1 and Z2. Starting from Z3 to Z5, LF moved faster than the AF but at the megalopa stage, both foods moved from HP to the 5th A.S. at the same time; the AF group exhibited delayed movement from MG until evacuation. At the C1 stage, both foods were only visible at the MG and their separation in time became marked i.e. the AF moving markedly slower than did the LF exhibiting GET values of 135 and 120 min, respectively. Thus, it appeared that the feeding strategy of the S. serrata larvae and juvenile modulated GET and digestive enzyme activities in response to the apparent digestibility of food presented.
Authors and Affiliations
Augusto Serrano Jr.
Keywords
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