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Under controlled conditions, juvenile eastern lung prawns Penaeus plebejus (Hess) (17 to 27 mm carapace length, CL) tagged with small streamer tags (80 mm long by 2 mm wide) displayed less apparent mortality (proportion of tagged prawns that either died or shed their tag) than those tagged with large streamer tags (90 mm long by 3 mm wide). There were no significant differences in taginduced mortality or tag shedding among tag treatments. The proportion of untagged (control) prawns that died was significantly less than that of prawns tagged with either size of streamer tag. During the 60 d experiment, apparent mortality was greatest over the first 5 and 6 d for small and large tags respectively. At the end of the experiment, mean apparent mortality was 2, 52 and 65 % for controls, small and large tags respectively. Shedding of tags contributed 14 and 19 % to the apparent mortality of prawns tagged with the small or large tags respectively. Growth increments of prawns surviving to the end of the experiment did not differ between prawns tagged with large or small tags, but did differ between sexes (females had a bigger increase in CL than males). Streamer tags of the sizes tested were considered unsuitable for tagging eastern king prawns of 17 to 27 mm CL.

Effects of sizes of streamer tags on mortality and growth of juvenile eastern king prawns Penaeus plebejus