FN Archimer Export Format PT J TI Reproductive behaviour of two tilapia species ( Oreochromis niloticus , Linné, 1758; Sarotherodon melanotheron, Rüppel, 1852) in freshwater intra and interspecific pairing context BT AF AKIAN, Dieudonne YAO, Kouakou CLOTA, Frederic LOZANO, Paul BAROILLER, Jean Francois CHATAIN, Beatrice BEGOUT, Marie-Laure AS 1:1,2,3;2:2;3:4;4:5;5:5;6:6;7:3; FF 1:;2:;3:;4:;5:;6:PDG-RBE-MARBEC-LAAAS;7:PDG-RBE-HGS; C1 INP HB, Dept FOREN, Yamoussoukro, Cote Ivoire. UNA, UFR-SN, Laboratoire de Biologie et Cytologie Animales, Cote d’Ivoire Ifremer, Laboratoire Ressources Halieutiques, L’Houmeau, France INRA, Unit 0558 Dept. PHASE, Nouzilly, France CIRAD, UMR 116 ISEM, Montpellier, France Ifremer, UMR 9190 MARBEC, Palavas-les-Flots, France C2 INP HB, COTE IVOIRE UNIV NANGUI ABROGOUA UNA, COTE IVOIRE IFREMER, FRANCE INRA, FRANCE CIRAD, FRANCE IFREMER, FRANCE SI PALAVAS LA ROCHELLE SE PDG-RBE-MARBEC-LAAAS PDG-RBE-HGS UM MARBEC IN WOS Ifremer jusqu'en 2018 copubli-france copubli-p187 copubli-int-hors-europe copubli-sud IF 1.548 TC 4 UR https://archimer.ifremer.fr/doc/00376/48673/49008.pdf LA English DT Article DE ;Aggression;Hybridization;Reproduction;Oreochromis niloticus;Sarotherodon melanotheron;Freshwater AB Nile tilapia Oreochromis niloticus (NT) and Black-chinned tilapia Sarotherodon melanotheron (BCT) are respectively characterized by fast growth and water salinity tolerance which attract the farmers who could take advantage of both species characteristics by producing hybrids reared in brackish or marine waters. Little information is however available about social interactions between the two species which are distinct by their mode of parental care (oral incubation). The objective of this study was to determine the behaviour of the two species, NT and BCT placed in freshwater intraspecific and interspecific pairing contexts. Females of both species (n = 20 per species) were first isolated for 90 days in a 60 L aquarium to determine the average duration between spawning in the absence of males. With the approach of 4th spawning or after 90 days of isolation, intra and interspecific pairing (fish average weight 200.4 ± 5.1 g) were made 10 times by pairing mode in a 350 L aquarium. The day after fish pairing, 15 min videos were recorded at one hour intervals from 8:00 h to 17:00 h, and courtship and aggressiveness behaviour were quantified. The results showed that isolated NT females had an average duration between two spawning of 15.9 days. No spawning was observed in BCT females. Spawning events were observed in the NT intraspecific pairs, with strictly maternal oral egg incubations. Behavioural differences and some similarities were noted between the two species. NT male was the most dominant in front of females of both species and NT females showed dominance on BCT males. No clear hierarchy was observed in BCT pairs. Courtship behaviours were observed in all pairings with longer durations in NT pairs. Nest building was observed from 8:00 h to 17:00 h in both sexes of BCT and male NT. NT females built nests from 11:00 h with longer durations when paired with males BCT than when paired with their conspecific males. These first results, reflecting behavioural plasticity in both species suggested that other breeding conditions favouring less aggressive behaviour could lead to a natural interspecific hybridization between NT and BCT. PY 2017 PD AUG SO Applied Animal Behaviour Science SN 0168-1591 PU Elsevier Science Bv VL 193 UT 000407539500015 BP 104 EP 113 DI 10.1016/j.applanim.2017.03.005 ID 48673 ER EF