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Zoomorphology

, Volume 104, Issue 6, pp 365–372 | Cite as

Morphology and histology of the anterior dorsal fin of Gaidropsarus mediterraneus (Pisces Teleostei), a specialized sensory organ

  • K. Kotrschal
  • M. Whitear
  • H. Adam
Article

Summary

The morphology and fine structure of the vibratile anterior dorsal fin of the rockling Gaidropsarus mediterraneus are described. 60–80 fin rays project as a fringe from a reduced fin web; their lateral movement maintains the fin in almost constant rapid undulation, at a frequency of 3–4 beats per second. The fin can be laid back and with-drawn into a groove. Erector and depressor muscles, which are histologically distinct, move each ray. The fin support is modified, incorporating elastic cartilage, and enclosed in a capsule of collagenous connective tissue. The epidermis at the frontal and caudal aspect of each ray contains numerous receptor cells, over 100,000 per mm2, which have an apical microvillus and synaptic connections with nerve fibres. The recurrent facial nerve sends a major branch to the dorsal fins, which is joined by dorsal ramuli of spinal nerves. It is calculated that there are three to six million receptor cells on the vibratile fin and in the epidermis of the dorsal groove, in individuals of average size. Taste buds do not occur in the skin of the groove, contrary to a previous report, nor on the vibratile fin rays, although they are present on the prominent most anterior fin ray and elsewhere on the fins and barbels. The undulatory motion of the fin draws sea water towards and through the vibratile rays and backwards as a perceptible current. The fin constitutes a specific sensory organ, a water sampler, peculiar to this rockling and related species.

Keywords

Facial Nerve Sensory Organ Spinal Nerve Apical Microvillus Undulatory Motion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbrevations used in figures

a

aperture

am

axial muscles

bl

base of lepidotrichion

cc

collagenous capsule

dlc

dorsal longitudinal canal

dr

distal radial

drs

dorsal ramulus of a spinal nerve

e

epidermal cell(s)

ec

elastic cartilage

en

extracapsular branch of the recurrent facial nerve

fm

fin membrane

fr

fin ray

frn

fin ray nerve

in

intracapsular branches of the recurrent facial nerve

l

lepidotrichia

n

nerve plexus

ns

neural spine

pr

proximal radial

rc

receptor cell(s)

rdm

radial depressor muscle

rem

radial erector muscle

s

scales

t

tendons

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References

  1. Alexander RMcN (1966) Structure and function in the catfish. J Zool 148:88–152Google Scholar
  2. Andriashev AP (1944) Role of sensory organs in the food procuring in Gaidropsarus mediterraneus. (In Russian, English summary). Zh Obshch Biol 5:123–127Google Scholar
  3. Arita GS (1971) A re-examination of the functional morphology of the soft rays in teleosts. Copeia 1971:691–697Google Scholar
  4. Aronov MP (1959) On external gustatory apparatus of the shore rockling. (In Russian). Nauchn Dokl Vyssh Shk Biol Nauki 4:38–41Google Scholar
  5. Bardach JE, Atema J (1971) The sense of taste in fishes. In: Beidler LM (ed) Handbook of sensory physiology, vol IV/2. Springer, Berlin Heidelberg New York, pp 293–336Google Scholar
  6. Bateson W (1890) The sense-organs and perceptions of fishes; with remarks on the supply of bait. J Mar Biol Assoc UK 1:225–256Google Scholar
  7. Becerra J, Montes GS, Bexiga SRR, Junqueira LCU (1983) Structure of the tail fin in teleosts. Cell Tissue Res 230:127–137Google Scholar
  8. Bogoljubsky S (1908) Zur Kenntnis der Dorsalflosse bei Motella tricirrata. Z Wiss Zool Abt A 90:327–333Google Scholar
  9. Couch J (1864) A history of the fishes of the British Islands. Vol III. Groombridge, LondonGoogle Scholar
  10. Crisp M, Lowe GA, Laverack MS (1975) On the ultrastructure and permeability of taste buds of the marine teleost Ciliata mustela. Tissue Cell 7:191–202Google Scholar
  11. Eaton TH (1945) Skeletal supports of the medial fins of fishes. J Morphol 76:193–212Google Scholar
  12. Fox H, Lane EB, Whitear M (1980) Sensory nerve endings and receptors in fish and amphibians. In: The skin of vertebrates; Symp Linn Soc Lond No 9, Spearman RIC, Riley PA (eds). Academic Press, London, pp 271–281Google Scholar
  13. Gibson RN (1967) The use of the anaesthetic Quinaldine in fish ecology. J Anim Ecol 36:295–301Google Scholar
  14. Goodrich ES (1904) On the dermal fin rays of fishes — living and extinct. Q J Microsc Sci 47:465–522Google Scholar
  15. Grover-Johnson N, Farbman AI (1976) Fine structure of taste buds in the barbel of the catfish, Ictalurus punctatus. Cell Tissue Res 169:395–403Google Scholar
  16. Hirata Y (1966) Fine structure of the terminal buds on the barbels of some fishes. Arch Histol Jpn Niigata Jpn 26:507–523Google Scholar
  17. Hureau JC, Monod T (eds) (1973) Check-list of the fishes of the north-eastern Atlantic and of the Mediterranean. CLOFNAM, vol I. Unesco, ParisGoogle Scholar
  18. Lane EB, Whitear M (1977) On the occurrence of Merkel cells in the epidermis of teleost fishes. Cell Tissue Res 182:235–246Google Scholar
  19. Lane EB, Whitear M (1982) Sensory structures at the surface of fish skin. I. Putative chemoreceptors. Zool J Linn Soc 74:141–151Google Scholar
  20. Reutter K (1978) Taste organ in the bullhead (Teleostei). Adv Anat Embryol Cell Biol 55(1):1–98Google Scholar
  21. Schulte E, Holl A (1972) Feinbau der Kopftentakel und ihrer Sinnesorgane bei Blennius tentacularis (Pisces, Blenniiformes). Mar Biol 12:67–80Google Scholar
  22. Storch V, Welsch U (1970) Electron microscopic observations on the taste-buds of some bony fishes. Archvm Histol Jap 32:145–153Google Scholar
  23. Thomson JS (1912) The dorsal vibratile fin of the rockling (Motella). Q J Microsc Sci 58:241–256Google Scholar
  24. Uga S, Hama K (1967) Electron microscopic studies on the synaptic region of the taste organ of carps and frogs. J Electron Microsc Chiba Cy 16:269–275Google Scholar
  25. Welsch U, Storch V (1969) Die Feinstruktur der Geschmacksknospen von Welsen [Clarias batrachus (L.) und Kryptopterus bicirrhis (Cuvier et Valenciennes)]. Z Zellforsch Mikrosk Anat 100:552–559Google Scholar
  26. Whitear M (1952) The innervation of the skin of teleost fishes. Q J Microsc Sci 93:289–305Google Scholar
  27. Whitear M (1971) Cell specialization and sensory function in fish epidermis. J Zool 163:237–264Google Scholar

Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • K. Kotrschal
    • 1
  • M. Whitear
    • 2
  • H. Adam
    • 1
  1. 1.Zoologisches InstitutUniversität SalzburgSalzburgAustria
  2. 2.Zoology DepartmentUniversity College LondonLondonUK

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