Aspects of the Natural History of the Midwater Fish Lycodapus mandibularis (Zoarcidae) in Monterey Bay, California

  • Anderson M
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Abstract

Aspects of the biology of the mesopelagic fish L. mandibularis are considered, primarily on the basis of closing midwater trawl samples from Monterey Bay, California. Major population centers focus in eastern North Pacific submarine canyons and deep-water inlets. The species undergoes a diel vertical migration, but not all individuals may participate in each period. Ripe individuals were found year-round and spawning is nonseasonal, probably occurring in midwater. Age estimates from otoliths showed the greatest proportion of the population sampled was of age classes III and IV, the ages at onset of maturity. The oldest individuals found were 5 years old, but estimates from the oldest fish may be biased. Feeding during the day was chiefly in surface waters, but night or day feeding in deep water may have occurred. Food items of young fish were different from those of adults but both fed heavily on planktonic crustaceans. Fish in California waters were parasitized by the nematode Thynnascaris aduncum and to a lesser degree by the copepod Cardiodectes medusaeus

Author-supplied keywords

  • 5 YEARS OLD
  • A
  • AGE
  • Adults
  • BAY
  • BIOLOGY
  • CRUSTACEANS
  • California
  • Cardiodectes
  • Cardiodectes medusaeus
  • DEEP
  • DEEP-WATER
  • DIEL
  • DIEL VERTICAL MIGRATION
  • Deep water
  • EASTERN
  • FOCUS
  • FOOD
  • HISTORY
  • INDIVIDUALS
  • IV
  • MATURITY
  • MONTEREY BAY
  • Midwater fish
  • NATURAL-HISTORY
  • NORTH
  • North Pacific
  • ONSET
  • PACIFIC
  • Planktonic
  • RECORD
  • SAMPLES
  • SURFACE
  • SURFACE-WATER
  • Spawning
  • Submarine canyons
  • Surface Water
  • Surface waters
  • WATERS
  • Water
  • YOUNG
  • Zoarcidae
  • adult
  • age estimates
  • article
  • copepod
  • crustacean
  • feeding
  • fish
  • midwater
  • migration
  • nematode
  • otolith
  • otoliths
  • population
  • sample
  • species
  • thynnascaris
  • vertical migration

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Authors

  • M E Anderson

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