Abstract
Although the post-larvae of many species of inshore penaeid prawns migrate from the sea into estuarine habitats the mechanisms by which this process occurs have not been adequately explained. Collections of penaeid post-larvae in the St. Lucia estuary in Natal, South Africa during flood and ebb tides, day and night, were dominated by Penaeus japonicus Bate and P. indicus Milne Edwards. P. indicus was most abundant over flood tides, day and night but P. japonicus was markedly more nocturnal and only abundant over night floods. Vertical distribution differed in the two species. P. japonicus was more abundant in bottom samples but this was much less apparent in P. indicus. It is suggested that movement into the water column is triggered by pressure changes and this is modified by light, salinity, and the nature of the substratum. These responses are discussed in relation to the invasion of estuaries by penaeid post-larvae and the apparent survival of P. indicus but not P. japonicus in the St. Lucia system.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: Journal of Experimental Marine Biology and Ecology
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.