Sound production by adult haddock, Melanogrammus aeglefinus, in isolation, pairs and trios

  • Bremner A
  • Trippel E
  • Terhune J
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Abstract

Haddock, Melanogrammus aeglefinus, have been previously shown to produce sounds during mating. Several behavioural aspects of sound production of courting haddock were further investigated in relation to sex ratio. We assessed whether (i) single males or females generate sounds when isolated, (ii) sound is produced when one male is present with a female, (iii) sound production becomes altered with the introduction of an additional male, and (iv) sounds are produced independent of egg release. Data were collected from 30 March to 11 June 1999, during the spawning period using small outdoor tanks. Sounds generated by captive males during spawning were categorized as knocks, hums and an intermediate between these two types. Solitary males and females did not produce sounds. Sounds were produced when one male was present with a single female. The knocking call duration increased when a second male was introduced. Sounds produced by males occurred independent of the day of egg release.

Author-supplied keywords

  • Behaviour
  • Captivity
  • Egg production
  • Mating calls
  • Spawning
  • Underwater sound

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Authors

  • Amanda A. Bremner

  • Edward A. Trippel

  • John M. Terhune

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