Feeding ecology of elasmobranch species in southeastern Brazil Author Viana, Alessandra F. Instituto de Biologia, Universidade Federal do Rio de Janeiro. Avenida Carlos Chagas Filho, 373, Bloco A, 21941 - 902 Rio de Janeiro, RJ, Brazil fviana.ale@gmail.com Author Valentin, Jean L. Instituto de Biologia, Universidade Federal do Rio de Janeiro. Avenida Carlos Chagas Filho, 373, Bloco A, 21941 - 902 Rio de Janeiro, RJ, Brazil jlv@biologia.ufrj.br Author Vianna, Marcelo Instituto de Biologia, Universidade Federal do Rio de Janeiro. Avenida Carlos Chagas Filho, 373, Bloco A, 21941 - 902 Rio de Janeiro, RJ, Brazil mvianna@biologia.ufrj.br text Neotropical Ichthyology 2017 2017-07-03 15 2 e 160176 e 160176 http://dx.doi.org/10.1590/1982-0224-20160176 journal article 315152 10.1590/1982-0224-20160176 78a913c1-2071-4532-b41f-bc4c07211d82 1982-0224 20126061

Tab. 4. Frequency of occurrence (%FO), percentage weight (%W) and alimentary index (%IAi) of prey items in the total diet of Rioraja agassizii in the southeastern Brazil, between January 2006 and August 2007, total, according to sex and stage of maturity.

	Total (n=104)			Females (n=55)			Males (n=49)			Juveniles (n=22)			Adults (n=82)
	%FO	%W	%IAi	%FO	%W	%IAi	%FO	%W	%IAi	%FO	%W	%IAi	%FO	%W	%IAi
Crustaceans	88.5	55.3	60.7	89.0	52.6	55.4	91.8	73.2	80.4	95.5	66.5	75.0	87.8	54.2	59.1
Brachyura not identified	8.7	7.5	2.9	12.7	8.5	4.3	4.1	0.7	0.1	4.5	5.0	0.5	9.8	7.7	3.5
Portunidae	10.6	16.0	7.6	16.4	18.0	11.8	4.1	2.2	0.3	4.5	1.5	0.1	12.2	17.4	9.7
Portunus sp.	1.9	0.6	0.1	3.6	0.7	0.1							2.4	0.7	0.1
Portunus spinicarpus	5.8	13.6	3.5	9.1	15.5	5.6	2.0	0.6	0.04	4.5	0.9	0.1	6.1	14.8	4.1
Shrimp not identified	18.3	4.5	3.8	16.3	3.3	2.2	20.4	12.5	8.6	54.5	49.2	53.8	8.5	0.2	0.1
Caridea	5.8	0.7	0.2	7.2	0.7	0.1	4.1	0.7	0.1	4.5	0.3	0.02	6.1	0.7	0.2
Alpheidae	1.0	0.0	0.0				2.0	0.0	0.0				1.2	0.0	0.0
Processidae
Processa sp.	1.9	0.1	0.0				4.1	0.8	0.1				2.4	0.1	0.01
Pasiphaeidae
Leptochela sp.	19.2	2.8	2.4	10.9	0.6	0.2	28.6	16.9	16.3	22.7	3.5	1.6	18.3	2.7	2.2
Leptochela serratorbita	1.0	0.4	0.0				2.0	2.7	0.2				1.2	0.4	0.0
Dendobranchiata
Penaeoidea	21.2	1.0	3.8	14.5	1.4	0.8	28.6	21.1	20.3	13.6	1.9	0.5	23.2	4.2	4.4
Penaeidae	1.9	0.3	0.0	3.6	0.3	0.0							2.4	0.3	0.0
Artemesia longinarius	1.0	0.2	0.0	1.8	0.2	0.0							1.2	0.2	0.0
Farfantepenaeus brasiliensis	1.0	0.4	0.0				2.0	2.7	0.2				1.2	0.4	0.0
Litopenaeus schmitti	1.0	0.3	0.0				2.0	2.3	0.2				1.2	0.3	0.0
Rimapenaeus sp.	1.0	0.3	0.0				2.0	2.3	0.2				1.2	0.3	0.0
Solenoceriadae
Mesopenaeus tropicalis	1.0	0.05	0.0				2.0	0.4	0.03				1.2	0.1	0.0
Thalassinidea	1.0	0.1	0.0				2.0	0.6	0.04				1.2	0.1	0.0
Amphipoda
Gamaridea	1.9	0.1	0.0	1.8	0.1	0.0004	2.0	0.2	0.02	4.5	0.3	0.02	1.2	0.1	0.0
Ampelisca sp.	1.0	0.0	0.0				2.0	0.3	0.01	4.5	0.5	0.04
Stomatopoda not identified	1.0	0.9	0.0	1.8	1.0	0.1							1.2	1.0	0.1
Squilla sp.	1.0	0.7	0.0	1.8	0.8	0.1							1.2	0.8	0.0
Lophogastrida	1.0	0.0	0.0				2.0	0.4	0.03				1.2	0.1	0.0
Crustacean fragments	23.1	2.0	2.1	18.1	1.4	1.0	28.6	5.9	5.7	13.6	3.4	0.9	25.6	1.9	2.2
Teleosts	71.2	44.4	39.2	80.0	47.1	44.5	61.2	26.8	19.6	68.2	30.8	24.8	72.0	45.8	40.9
Teleost fragments	67.3	22.9	69.6	75.5	22.7	67.9	59.2	23.6	47.3	68.2	30.8	42.1	67.1	22.1	67.9
Raneya fluminensis	3.8	21.6	3.8	5.5	24.3	5.3	2.0	3.1	0.2				4.9	23.7	5.3
Nematods	2.9	0.3	0.0	3.6	0.3	0.0	2.0	0.0	0.0	4.5	2.7	0.1	2.4	0.0	0.0
Nematods not identified	2.9	0.3	0.0	3.6	0.3	0.0	2.0	0.4	0.0	4.5	2.7	0.2	2.4	0.0	0.0