Applying genetic techniques to study remote shark fisheries in northeastern Madagascar

Figures & data

Table I.  Species identification assignments for samples collected in and around Antongil Bay Madagascar.

Species	n(COI)	n(ITS2)	n(total)	IUCN Red List	Fishery
Carcharhinus amboinensis	2	4	5	DD,u	a,t
Carcharhinus amblyrhynchos	1	8	8	NT,u	a
Carcharhinus albimarginatus	4	0	4	NT,u	a
Carcharhinus brevipinna	28	21	29	NT,u	a,t
Carcharhinus leucas	0	1	1	NT,u	a,t
Carcharhinus limbatus	1	1	1	NT,u	t
Carcharhinus obscurus*	6	5	6	V,d	a
Carcharhinus plumbeus	4	7	8	V,d	a,t
Carcharhinus sorrah	15	25	28	NT,u	a,m,t
Galeocerdo cuvier	9	4	11	NT,u	a,t
Hemipristis elongata	3	0	3	V,d	a,t
Loxodon macrorhinus	13	0	13	LC,u	a,m,t
Mustelus sp.	1	0	1		t
Prionace glauca	0	1	1	NT,u	a
Rhinobatos sp.	1	0	1		t
Rhizoprionodon acutus	40	0	40	LC,u	a,t
Sphyrna lewini	42	47	77	E,u	a,m,t
Sphyrna mokarran	0	1	1	E,d	m
Stegostoma fasciatum	1	0	1	V,d	a
Total	171	125	239

Species identified using COI or ITS2 are indicated, with the total number of individuals identified indicated (n(total)) to clarify overlap in the methods applied. IUCN Red List listings are given along with population trajectories (IUCN 2010). IUCN status: DD, data deficient; E, endangered; NT, near threatened, and V, vulnerable. Trends: d, decreasing and u, unknown. Fishery indicates whether the species were recorded in the artisanal fishery (a), traditional fishery (t), or market survey (m).

* ITS2 primers only identified as dusky (C. obscurus), Galapagos shark (C. galapagensis), or oceanic whitetip shark (C. longimanus), but species identification was confirmed through COI analysis.

Table II.  Comparison of local names assigned at time of collection with DNA-based species identification.

Local name	DNA-based species ID	n
Amboarano	Stegostoma fasciatum	1
Antendromaso	C. brevipinna (1), C. sorrah (2), P. glauca (1), S. lewini (19)	23
Antsingora	C. brevipinna (9), C. sorrah (2), L. macrorhinus (8), R. acutus (1), S. lewini (3)	23
Antsingora ambanivava	R. acutus	1
Antsingora biloha	C. albimarginatus	1
Antsingora bosy	G. cuvier (3)	3
Antsingora dofodoha	C. amboinensis	1
Antsingora fasika	R. acutus	1
Antsingora fotsy	C. amboinensis (1), C. obscurus (2), C. plumbeus (1), C. sorrah (1), L. macrorhinus (1), R. acutus (2)	8
Antsingora lava tsiko	L. macrorhinus (3)	3
Antsingora mainty	C. obscurus	1
Antsingora tapakafo	C. brevipinna	1
Antsingora tasika	R. acutus	1
Antsingora vato	R. acutus (2)	2
Sorkay	Rhinobatos sp.	1

Data in parentheses are the number of individuals within each assignment and category.

IUCN. 2010. IUCN Red List of threatened species, Version 2010.2 [Online] Available at www.iucnredlist.org [accessed 15 September 2010].

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