Anatomy of the olfactory system and potential role for chemical communication in the sound‐producing Lusitanian toadfish, Halobatrachus didactylus

The current study investigated the structure and function of the olfactory system of the Lusitanian toadfish, Halobatrachus didactylus, using histology and electrophysiology (electro‐olfactogram [EOG]), respectively. The olfactory system consists of a digitated anterior peduncle, of unknown function...

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Bibliographic Details
Published in:Journal of fish biology 2024-07, Vol.105 (1), p.59-71
Main Authors: Modesto, Teresa, Neves Gregório, Beatriz, Marcelino, Gonçalo, Marquet, Nathalie, Costa, Rita A., Guerreiro, Pedro M., Velez, Zélia, Hubbard, Peter C.
Format: Article
Language:English
Subjects:
Accessory gland
accessory glands
Amino acids
Batrachoididae
Bile
Bile acids
Body fluids
Chambers
Chemical communication
Communication
Electrophysiology
electro‐olfactogram
Epithelium
Fluids
Glands
Halobatrachus didactylus
Histology
Immunoreactivity
intestinal fluid
Intestine
Lacrimal gland and Nasolacrimal duct
Males
Mucus
Olfaction
Olfactory epithelium
Olfactory thresholds
pheromone
reproduction
Sedentary species
Skin tests
Structure-function relationships
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Summary:The current study investigated the structure and function of the olfactory system of the Lusitanian toadfish, Halobatrachus didactylus, using histology and electrophysiology (electro‐olfactogram [EOG]), respectively. The olfactory system consists of a digitated anterior peduncle, of unknown function, containing the inhalant nostril. This then leads to a U‐shaped olfactory chamber with the olfactory epithelium—identified by Gαolf‐immunoreactivity—on the ventral surface. A large lacrimal sac is connected to this tube and is likely involved in generating water movement through the olfactory chamber (this species is largely sedentary). The exhalent nostril lies by the eye and is preceded by a bicuspid valve to ensure one‐way flow of water. As do other teleosts, H. didactylus had olfactory sensitivity to amino acids and bile acids. Large‐amplitude EOG responses were evoked by fluid from the anterior and posterior testicular accessory glands, and bile and intestinal fluids. Anterior gland and intestinal fluids from reproductive males were significantly more potent than those from non‐reproductive males. Male urine and skin mucus proved to be the least potent body fluids tested. These results suggest that chemical communication—as well as acoustic communication—may be important in the reproduction of this species and that this may be mediated by the accessory glands and intestinal fluid.
ISSN:0022-1112
1095-8649
1095-8649
DOI:10.1111/jfb.15751