Utility of rostra in the identification of Australian sawfishes (Chondrichthyes: Pristidae). Issue 6 (3rd October 2013)

• Record Type: Journal Article
• Authors: Whitty, Jeff M.; Phillips, Nicole M.; Thorburn, Dean C.; Simpfendorfer, Colin A.; Field, Iain; Peverell, Stirling C.; Morgan, David L.
• Is Part Of: Aquatic conservation. Volume 24:Issue 6(2014)
• Page Start: 791
• Page End: 804
• Publication Date: 2013-10-03
• Subjects: Aquatic ecology -- Periodicals; Conservation of natural resources -- Periodicals; Aquatic resources -- Periodicals; 333.95216
• DOI: 10.1002/aqc.2398
• Languages: English
• ISSNs: 1052-7613

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p> <list id="aqc2398-list-0001" list-type="order"> <list-item id="aqc2398-li-0001"> <p>Effective management of critically endangered sawfishes can be a difficult task, in part due to interspecies misidentification. Current methods for identifying sawfishes can be impractical as they are based on morphological features that are often unobservable. Further exploration is required to develop a more reliable means of identification.</p> </list-item> <list-item id="aqc2398-li-0002"> <p>This study explored the utility of sawfish rostra in determining the species, size and sex of sawfishes, as rostra are commonly the only feature of a sawfish observed by fishers or present in public and private collections.</p> </list-item> <list-item id="aqc2398-li-0003"> <p>A morphometric and meristic database consisting of over 1100 narrow sawfish (<italic>Anoxypristis cuspidata</italic>), dwarf sawfish (<italic>Pristis clavata</italic>), largetooth (or freshwater) sawfish (<italic>Pristis pristis</italic>; formerly <italic>Pristis microdon</italic>) and green sawfish (<italic>Pristis zijsron</italic>) rostra from Australian waters, was statistically analysed.</p> </list-item> <list-item id="aqc2398-li-0004"> <p>Identification of sawfishes was found to be possible through the use of the variables: inter‐tooth spacing, standard rostrum width/standard rostrum length, standard rostrum length/total rostrum length, rostrum tip width/standard rostrum length, and/or rostral tooth count range, although the distinguishing variables were species‐dependent.</p> </list-item> <list-item id="aqc2398-li-0005"> <p>The relationship between standard rostrum length and total length was also observed to vary substantially between most species. Models for estimating total length from standard rostrum length are provided.</p> </list-item> <list-item id="aqc2398-li-0006"> <p>This study has provided a tool that can be used to identify accurately the species and size of sawfishes by their rostra, and therefore can assist in clarifying historical and contemporary sawfish records, nomenclature and distributions. A better understanding of these issues should allow sawfish conservation strategies to become more focused, and thus more effective.</p> </list-item> </list> Copyright © 2013 John Wiley & Sons, Ltd.</p> </abstract>