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Effect of oral suction and other friction-enhancing behaviors on the station-holding performance of suckermouth catfish (Hypostomus spp.)

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Abstract:

Effect of oral suction and other friction-enhancing behaviors on the ability to maintain position in a current (station-holding) was determined for the suckermouth catfish (genus Hypostomus Lacépède, 1803). Fish were tested using an increasing velocity test on three substrata (smooth Lucite®, rough Lucite®, and wire grid). On the smooth substratum, use of oral suction and other behaviors delayed the need to swim continuously out of ground contact from 9.1± 0.3cm/s (uslip) to 89.2± 7.9cm/s (uswim). Trials on the wire grid showed that oral suction was ineffective as predicted; however, fish were able to use other friction-enhancing behaviors instead to improve station-holding performance. Behaviors that increased friction by hooking the fish to the substrate via the odontodes and pectoral fin spines were very effective at delaying the need for steady swimming from 12.9to 145.0cm/s. On the rough substratum, fish were able to use both oral suction and the odontodes or fin spines to increase friction, and station-holding performance was similar to values on the wire substratum. Thus, while use of the oral suction disk was shown to improve station-holding performance, use of other morphological features such as the odontodes and fin spines may be equally important.

Les effets de la succion orale et des autres comportements qui favorisent la friction sur la capacité du poisson-chat cuirassé à ventouse (genre Hypostomus Lacépède, 1803) à demeurer sur place dans un courant (maintien de position) ont été déterminés. Des tests utilisant des vitesses croissantes sur trois substrats (Lucite® unie, Lucite® rugueuse et grille de fils métalliques) ont servi à évaluer les poissons. Sur le substrat uni, l’utilisation de la succion orale et les autres comportements retardent la nécessité de nage continue au-dessus du substrat de 9,1 ± 0,3 cm/s (uglissement) à 89,2 ± 7,9 cm/s (unage). Les essais sur la grille de fils métalliques montrent, tel que prévu, l’inefficacité de la succion orale, mais les poissons peuvent utiliser à la place d’autres comportements pour augmenter la friction et améliorer leur performance de maintien de position. Les comportements qui augmentent la friction en accrochant le poisson au substrat à l’aide d’odontodes ou d’épines des nageoires pectorales sont très efficaces et ils retardent la nécessité de nage continue de 12,9 à 145,0 cm/s. Sur le substrat rugueux, les poissons peuvent utiliser à la fois la succion orale et les odontodes ou épines des nageoires pour accroître la friction; leur performance de maintien de position est semblable à celle observée sur le substrat de fils métalliques. Ainsi, on peut démontrer que l’utilisation de la succion du disque oral améliore la performance du maintien de position; cependant l’utilisation des autres structures morphologiques, telles que les odontodes et les épines des nageoires, peut être aussi importante.

Document Type: Research Article

Publication date: January 1, 2007

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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