Ampullary organ morphology of freshwater salmontail catfish,Arius graeffei

Whitehead, Darryl L.; Tibbetts, Ian R.; Daddow, L.

doi:10.1002/1097-4687(200011)246:2<142::aid-jmor8>3.0.co;2-d

Cited by 15 publications

(1 citation statement)

References 7 publications

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“…The canals of the ampullary organs in P. anguillaris measure in cms and the ampullae include hundreds of receptor cells. Whitehead et al (1999Whitehead et al ( , 2000 described three morphological types of ampullary organs in the estuarine cat sh, Arius graeffei. These three forms may represent adaptations for changes in habitat (freshwater, estuarine and marine) during the sh's lifecycle.…”

Section: Localising Prey In Saltwater and Freshwatermentioning

confidence: 99%

The functional roles of passive electroreception in non-electric fishes

Collin¹,

Whitehead²

2004

Animal Biol

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Passive electroreception is a complex and specialised sense found in a large range of aquatic vertebrates primarily designed for the detection of weak bioelectric elds. Particular attention has traditionally focused on cartilaginous shes, but a range of teleost and non-teleost shes from a diversity of habitats have also been examined. As more species are investigated, it has become apparent that the role of electroreception in shes is not restricted to locating prey, but is utilised in other complex behaviours. This paper presents the various functional roles of passive electroreception in non-electric shes, by reviewing much of the recent research on the detection of prey in the context of differences in species' habitat (shallow water, deep-sea, freshwater and saltwater). A special case study on the distribution and neural groupings of ampullary organs in the omnihaline bull shark, Carcharhinus leucas, is also presented and reveals that prey-capture, rather than navigation, may be an important determinant of pore distribution. The discrimination between potential predators and conspeci cs and the role of bioelectric stimuli in social behaviour is discussed, as is the ability to migrate over short or long distances in order to locate environmentally favourable conditions. The various theories proposed regarding the importance and mediation of geomagnetic orientation by either an electroreceptive and/or a magnetite-based sensory system receives particular attention. The importance of electroreception to many species is emphasised by highlighting what still remains to be investigated, especially with respect to the physical, biochemical and neural properties of the ampullary organs and the signals that give rise to the large range of observed behaviours.

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Section: Localising Prey In Saltwater and Freshwatermentioning

confidence: 99%

The functional roles of passive electroreception in non-electric fishes

Collin¹,

Whitehead²

2004

Animal Biol

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Río de la Plata voyagers: Deciphering the migration ecology of a vulnerable marine catfish (Genidens barbus) in a large subtropical river (lower Uruguay River)

Vidal

D’Anatro²,

González‐Bergonzoni³

et al. 2021

Aquatic Conservation

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Genidens barbus is a vulnerable marine migrant catfish with low fecundity, a complex life cycle (i.e. mouth breeding), and is the target of industrial and artisanal fisheries of several countries. This species regularly migrates from marine to freshwater environments of the south‐western Atlantic. The aim of this work was to delve deeper into the migration ecology of G. barbus, characterizing both its timing and potential environmental drivers. Furthermore, aspects of the population structure and reproduction of migrants in the lower Uruguay River were studied and the presence of juveniles in the adjacent estuarine recruitment area was evaluated. Data from 11 years (2008–2018) of records of adult G. barbus captured by artisanal fisheries were used alongside relevant environmental variables that were recorded monthly. Reproductive biology (i.e. sex ratio, gonadosomatic index, fecundity, and oocyte size) was analysed for a period of 3 years (2016–2018). The juvenile abundance in the Río de la Plata estuary was evaluated seasonally. A total of 935 adult individuals of G. barbus were captured, representing a total biomass of 3,123 kg. The migration timing was from early spring to early summer. The abundance of migrants strongly increased with river discharge, suggesting that this variable regulates the upriver migration. Furthermore, pre‐ and post‐spawn females and males displaying mouth breeding were recorded during the study period, confirming G. barbus reproduction in the lower Uruguay River. The results obtained suggest that G. barbus ascend to spawn in the freshwater environments upstream from the mouth of the Uruguay River. Then, adult males incubate and carry the embryos downstream, releasing juveniles in the Río de la Plata estuary. This relevant information will help with the implementation of effective management polices (e.g. fishing restrictions during the reproductive period) for the presently unregulated fishery of this vulnerable species in the lower Uruguay River.

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Structural Characteristics and Development of Ampullary Organs in Acipenser naccarii

Camacho¹,

Ostos²,

Llorente³

et al. 2007

The Anatomical Record

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Ampullary organs of Acipenser naccarii sturgeons were examined by optical and electronic microscopy (transmission electron microscopy and scanning electron microscopy) from hatching until 1 month later when the juvenile phase is completely established. It was observed that, when A. naccarii begins to feed actively, the ultrastructural characteristics of ampullary organs already correspond to those of adult animals. These organs may, therefore, be functional and, together with taste buds, facilitate food search after exhaustion of yolk sac food reserves. Mature ampullary organs of A. naccarii are formed by an ampulla that communicates with the exterior by means of a short channel. These ampullae correspond to the sensory portion of these receptors and are formed by two cell types: receptor cells and support cells. Receptor cells present a kinocilium on their free surface and establish ribbon synapses with axon nerve endings that arise from the underlying conjunctive tissue. Support cells enclose receptor cells, bear stereocilia and occasional cilia, and are of a secretory nature. The mucus associated with ampullary organs mainly comprises neutral mucopolysaccharides, whereas mucopolysaccharides are usually acid in other fish groups.

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Ampullary organ morphology of freshwater salmontail catfish,Arius graeffei

Cited by 15 publications

References 7 publications

The functional roles of passive electroreception in non-electric fishes

The functional roles of passive electroreception in non-electric fishes

Río de la Plata voyagers: Deciphering the migration ecology of a vulnerable marine catfish (Genidens barbus) in a large subtropical river (lower Uruguay River)

Structural Characteristics and Development of Ampullary Organs in Acipenser naccarii

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