Touch sensation by pectoral fins of the catfish<i>Pimelodus pictus</i>

Hardy, Adam R.; Steinworth, Bailey; Hale, Melina E.

doi:10.1098/rspb.2015.2652

Cited by 26 publications

(22 citation statements)

References 36 publications

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“…In combination with previous work in the pectoral fin [18,19], the discovery that adipose fins, which are passive median fins, can function as mechanosensors suggests that mechanosensation might be a general feature of fins. These results broaden our understanding of adipose fin function and also inform the evolution of proprioception in vertebrate appendages.…”

Section: Discussionmentioning

confidence: 98%

Mechanosensation in an adipose fin

Aiello¹,

Stewart²,

Hale³

2016

Proc. R. Soc. B.

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Adipose fins are found on approximately 20% of ray-finned fish species. The apparently rudimentary anatomy of adipose fins inspired a longstanding hypothesis that these fins are vestigial and lack function. However, adipose fins have evolved repeatedly within Teleostei, suggesting adaptive function. Recently, adipose fins were proposed to function as mechanosensors, detecting fluid flow anterior to the caudal fin. Here we test the hypothesis that adipose fins are mechanosensitive in the catfish Corydoras aeneus. Neural activity, recorded from nerves that innervate the fin, was shown to encode information on both movement and position of the fin membrane, including the magnitude of fin membrane displacement. Thus, the adipose fin of C. aeneus is mechanosensitive and has the capacity to function as a 'precaudal flow sensor'. These data force reevaluation of adipose fin clipping, a common strategy for tagging fishes, and inform hypotheses of how function evolves in novel vertebrate appendages.

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Section: Discussionmentioning

confidence: 98%

Mechanosensation in an adipose fin

Aiello¹,

Stewart²,

Hale³

2016

Proc. R. Soc. B.

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“…Heterobranchus longifilis : Kerdchuen & Legendre, ; Clarias gariepinus : Britz & Pienaar, ; Silurus glanis : Kozlowski & Poczyczynski, ; Mystus nemurus : Rahmah et al, ; Lophiosilurus alexandri : Kitagawa et al, ; Hatcheria macraei : Barriga, Espinos, Walter, & Miguel, ). Moreover, their elongated body shape along with flattened head having subterminal mouth and a prognathic upper lip, barbels and very small dorsal eyes enable them like other catfishes to use tactile techniques rather than visual sense for feeding (Alexander, ; Hardy, Steinworth, & Hale, ). Thus, these unique characteristics make them perfect nocturnal feeders and locomotors.…”

Section: Discussionmentioning

confidence: 99%

Effects of light and artificial fish shelter (PVC pipe) on some phenotypic traits of stinging catfish (Heteropneustes fossilisBloch, 1794)

et al. 2019

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Light and shelter are very important ecological factors that can affect many traits of fish. Therefore, a study was conducted to explore the effect of light and shelter on some phenotypic traits of stinging catfish (Heteropneustes fossilis Bloch, 1794). During experiment, equal‐sized juveniles (mean ± SE: 9.04 ± 0.09 cm) were collected and reared in aquariums dividing into four treatment groups, such as T1 (0L:24D without pipe), T2 (0L:24D with pipe), T3 (12L:12D without pipe) and T4 (12L:12D with pipe). Each treatment had 36 fish, which were randomly distributed into three replications. The fish were kept up to 120 days, and then, the growth performance and skin colour were analysed. The results showed that both lighting and shelter conditions as well as their interactions had significant effects on some traits expression. The analyses revealed that lighting condition significantly influenced body area, head width and skin coloration, while shelter condition significantly affected total and standard length, body area, and their interaction showed significant effects on body area, head width and anal fin length. Thus, this study indicates that stinging catfish show better growth performance and colour patterns especially in dark and sheltered conditions which could be recommended for the successive production of this highly priced fish species.

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“…Recent studies on the fins of the bluegill sunfish Lepomis macrochirus Rafinesque 1819 have shown that bending of the fin rays stimulates a mechanosensory response that allows it to avoid obstacles (Flammang & Lauder, ; Williams et al , ). Furthermore, the membranous pectoral fins of the pictus catfish Pimelodus pictus Steindachner 1876 have been shown to be passive mechanosensors, responding to both touch and bend stimulation (Hardy et al , ). The adipose fin of salmonids does not possess fin rays but it does have a system of overlapping actinotrichia.…”

Section: Discussionmentioning

confidence: 99%

New details of the neural architecture of the salmonid adipose fin

2016

Journal of Fish Biology

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The adipose fin of salmonids, once widely regarded as vestigial and lacking in function, was shown to be important to swimming efficiency in juvenile brown trout Salmo trutta. Examination with confocal microscopy of adipose fins of S. trutta stained with various antibodies targeting the nervous system revealed several large nerves entering the fin and anastomosing throughout its length. The branching nerves form a plexus with specific patterns of fine terminal branches in the leading and trailing edges. A network of astrocyte-like cells (ALCs) that is linked through cell processes to nerves and structural collagen reacted positively with antibodies to glial cells. No other fish fins, including other adipose fins, have been shown to exhibit this type of neural architecture. Many vertebrate mechanoreceptors rely on collagen deformation to stimulate responses in afferent nerves; similarly, the adipose fin also may function as a mechanosensor, where passive mechanical deflection by water currents stimulates afferent nerves.

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Touch sensation by pectoral fins of the catfishPimelodus pictus

Cited by 26 publications

References 36 publications

Mechanosensation in an adipose fin

Mechanosensation in an adipose fin

Effects of light and artificial fish shelter (PVC pipe) on some phenotypic traits of stinging catfish (Heteropneustes fossilisBloch, 1794)

New details of the neural architecture of the salmonid adipose fin

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