Editing Ganges shark (section)

=== Possibility of migration ===
Some researchers consider ''G. gangeticus'' to be [[Fish migration|amphidromous]], covering more than {{convert|100|km|abbr=on}} in both directions.<ref>{{cite journal |last1=Hărșan |first1=R. |last2=Petrescu-Mag |first2=I. V. |title=Endangered fish species of the world – a review |journal=AACL Bioflux |year=2008 |volume=1 |issue=2 |pages=193–216}}</ref> However, this is not thought to be for breeding, as the case in anadromous and catadromous species.<ref name="Ref. 51243">{{cite book |last=Riede |first=K. |title=2004 Global register of migratory species - from global to regional scales. Final Report of the R&D-Projekt 808 05 081. |year=2004 |publisher=Federal Agency for Nature Conservation |location=Bonn, Germany |pages=329}}</ref> The presence of newborn individuals in the Hooghly River suggests that the young may be born in fresh water.<ref name="MSIP"/>

A specimen photographed in 2011 by natural history journalist Malaka Rodrigo at [[Negombo]] fish market in Sri Lanka prompted researcher Rex de Silva to speculate on whether the species could occasionally be carried south of its normal range by ocean currents. However, only the head of the shark appears in the photo. Leading shark expert [[Leonard Compagno]] emphasised the need to check the dentition and the dorsal fin proportions to confirm the specimen as ''G. gangeticus'', stating that it could also be one of the four other named species.<ref>{{cite journal |last=de Silva |first=Rex I. |title=Does the Ganges shark ''Glyphis gangeticus'' stray to Sri Lanka? |journal=Journal of the Bombay Natural History Society |date=May–August 2011 |volume=108 |issue=2 |page=136 |url=https://www.researchgate.net/publication/215535273}}</ref>