Development of agonistic behaviour and vocalization in croaking gouramis The Sound-Producing Mechanism of the Croaking Gourami, Trichopsis vittatus (Pisces, Belontiidae) Sound Characteristics and Outcome of Contests in Male Croaking Gouramis (Teleostei) Significance of Agonistic Vocalization in the Croaking Gourami (Trichopsis vittatus, Teleostei) Significance of Agonistic Vocalization in the Croaking Gourami ( Trichopsis vittatus , Teleostei) Localization of Pectoral Fin Motoneurons (Sonic and Hovering) in the Croaking Gourami Localization of pectoral fin motoneurons (sonic and hovering) in the croaking gourami Trichopsis vittatus. Structure of the sound producing organ of the croaking Gourami ( Trichopsis vittatus Cuvier & Valenciennes) (Anabantidae, Belontiid... INTRA- AND INTERSPECIFIC DIFFERENCES IN AGONISTIC VOCALIZATION IN CROAKING GOURAMIS (GENUS: TRICHOPSIS, ANABANTOIDEI, TELEOSTEI) Females whisper briefly during sex: context- and sex-specific differences in sounds made by croaking gouramis