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Ichthyological Research

, Volume 52, Issue 2, pp 198–201 | Cite as

Competition for spawning sites between two gobiid fishes, Bathygobius fuscus and Eviota abax, derived by alteration of mating tactics of the former

  • Masanori Taru
  • Takeshi Kanda
  • Tomoki SunobeEmail author
Short Report

Abstract

Interspecific competition for spawning sites between two gobiid fishes, Bathygobius fuscus and Eviota abax, was studied on a rocky shore. Large males (LM: 55–80 mm in standard length: SL) and small males (SM: 34–52 mm SL) of B. fuscus acted as nest holders and sneakers, respectively, in the early spawning season (July). The sympatric male E. abax (22–33 mm SL) was smaller than SM B. fuscus, and synchronically used rocky holes much smaller than those of LM B. fuscus. In this season, aggressions between the two species were rarely observed. In late season (August), as the number of the LM decreased, the SM converted their tactics to nest holding, occupying nests of a sizes similar to those of E. abax. Eviota abax males were dispossessed by SM and shifted their nest sites to cavities between cobbles and sandy bottom, which might be poorer nest sites than rocky holes.

Key words

Interspecific competition Spawning site Mating tactics Gobiidae 

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Copyright information

© The Ichthyological Society of Japan 2005

Authors and Affiliations

  1. 1.Marine Biology Laboratory, Faculty of ScienceToho UniversityFunabashiJapan
  2. 2.Marine Science Station, Field Science Center, Faculty of AgricultureMiyazaki UniversityNobeokaJapan
  3. 3.Natural History Museum and Institute of ChibaChibaJapan

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