Secondary Folding of Olfactory Organ in Young and Adult Sea Trout

Bertmar, Gunnar

doi:10.1111/j.1463-6395.1972.tb00578.x

Cited by 16 publications

(2 citation statements)

References 5 publications

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“…No secondary foldings of the lamellae, as has been observed in trout (Bertmar, 1972), were observed. The mucus layer, which seems to cover the olfactory rosette at least in some ¢sh, (Breipohl et al, 1973;Zeiske et al, 1976) was not observed.…”

Section: Gross Morphologysupporting

confidence: 51%

Morphology and cytology of the olfactory organs in small juvenile Dascyllus aruanus and Amphiprion ocellaris (Pisces: Pomacentridae)

2003

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The olfactory organs in juvenile Dascyllus aruanus and Amphiprion ocellaris, studied by scanning and transmission electron microscopy (SEM and TEM), consisted of two bilaterally radial rosettes per specimen, fan-shaped, located medio-ventrally, one in each of two olfactory chambers. In D. aruanus the rosette comprises six lamellae, three on each side of a midline raphe; in A. ocellaris 12 lamellae, six on each side. In both species, the sensory regions in the lamellae are continuous, except for the margin of the lamellae, and richly covered with stereocilia. Areas with juvenile bipolar receptor cells were observed in both species. Two dissimilar types of olfactory receptor cells in the sensory epithelium: ciliated and microvillous were observed.

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Section: Gross Morphologysupporting

confidence: 51%

Morphology and cytology of the olfactory organs in small juvenile Dascyllus aruanus and Amphiprion ocellaris (Pisces: Pomacentridae)

2003

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“…Each naris has an average of 14-16 lamellae in salmonids (Hara et al 1973). Formation of secondary folding of more posteriorly located lamellae begins in 1-to 1.5-year-old parr of Baltic sea trout (anadromous brown trout) Salmo trutta trutta (Bertmar 1972). One week after hatching, the ciliated receptor cells are ultrastructurally mature and have as many as 14 cilia (2-7 /urn long, 0.3 /urn wide) radiating from the olfactory knob (compare Figure 2).…”

Section: Stage 19mentioning

confidence: 99%

Structural and Functional Development of the Olfactory Organ in Teleosts

Hara

Zielinski

1989

Transactions of the American Fisheries Society

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Fish detect chemical stimuli through two major chemosensory channels, olfaction and gustation. All current evidence indicates that olfaction is a major mediator of chemical signals and is involved in diverse teleost behavior. This paper descnbes the morphological components and the basic principles of developmental patterns of the olfactory organ as well as cellular differentiation of receptors in rainbow trout Oncorhynchus mykiss (formerly Salmo gairdneri). The olfactory organ originates from an anlage formed by the ectoderm on the ventrolateral pan of the head during stage 19(11 d postfertilization). Ciliated receptor cells appear at stage 24 (day 18) and dominate until immature microvillar receptor cells develop in stage-28 (day 26) embryos. During this period, the olfactory placode continues a lateral and upward migration. At stage 29, the day of hatching, the olfactory groove is enclosed by flaps of skin, and by stage 33, distinct anterior and posterior nares are formed. Spontaneous electrical activity is recorded from the olfactory mucosa as early as stage 25, and neural responses to chemical stimuli are induced from stage-26 embryos that contain sparse ciliated receptor cells. Stereochemical specificity of receptor responses is evident at these stages. We conclude that the olfactory receptor has two ontogenetically distinct forms, ciliated and microvillar. By the time of hatching, both cell types are mature and capable of responding and discriminating among chemical stimuli. The functional distinction of the olfactory system is discussed further in relation to the gustatory system, which is endodermal in origin and is still incomplete at hatching. 183

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Olfactory organ of acipenseriformes and comparison with other actinopterygians: Patterns of diversity

Chen

Arratia

1994

Journal of Morphology

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The position and structure of the olfactory organ and its openings vary among actinopterygians. The anterior nasal opening is a simple perforation in the skin in many extant actinopterygians (e.g., acipenseriforms, lepisosteids, and primitive Recent teleosts) and represents the primitive condition. Polypterids and Amia each exhibit a derived condition, in which the anterior nasal opening extends into a tube. The olfactory organ is relatively far away from the anterior end of the elongate rostrum in acipenseriforms, whereas the olfactory organs are closer to the anterior end of the snout in extant actinopterygians (e.g., polypterids, lepisosteids, and amiids). In adults, olfactory organs are cuplike structures in most actinopterygians, but these organs are tubelike in polypterids. Among extant actinopterygians, a nasal diverticulum is present only in polypterids. Teleosts have accessory nasal sacs, but chondrosteans, polypterids, lepisosteids, and amiids lack them. The olfactory rosette is formed by primary folds or lamellae that may be placed anterior, lateral, posterior, and/or medial to the axis of the organ. Large acipenserids have 20-32 lamellae, polyodontids have 13-18 lamellae, lepisosteids have 8-10 lamellae, and Amia may have over 100. In teleosts, the number of lamellae varies from none or a few to over 200. Secondary lamellae are present in acipenseriforms, lepisosteids, and some advanced teleosts; secondary lamellae are interpreted as independently acquired in these lineages. Secondary lamellae are absent in Amia and primitive teleosts such as Elops and Hiodon. Tertiary lamellae are present in Acipenser oxyrhynchus. The arrangement of the primary lamellae in relation to the axis of the organ results in at least 11 patterns of the olfactory rosette in actinopterygians. Lamellae that are enclosed in a tubelike sac and that have an anteromedial diverticulum are specializations of polypterids. Primary lamellae anterior, lateral, and posterior to an elongate axis are characteristic of lepisosteids. The presence of primary lamellae lateral, medial, and posterior to an elongate olfactory axis is a synapomorphy of Halecomorpha (Amia plus teleosts). The absence of secondary lamellae is a synapomorphy of Halecomorpha. © 1994 Wiley-Liss, Inc.

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Secondary Folding of Olfactory Organ in Young and Adult Sea Trout

Cited by 16 publications

References 5 publications

Morphology and cytology of the olfactory organs in small juvenile Dascyllus aruanus and Amphiprion ocellaris (Pisces: Pomacentridae)

Morphology and cytology of the olfactory organs in small juvenile Dascyllus aruanus and Amphiprion ocellaris (Pisces: Pomacentridae)

Structural and Functional Development of the Olfactory Organ in Teleosts

Olfactory organ of acipenseriformes and comparison with other actinopterygians: Patterns of diversity

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