In this paper, we (1) describe field observations of lake charr (trout) reproductive behaviour, focusing on two morphs from Great Bear Lake, N.T; (2) review and synthesize observations from the literature; and (3) summarize uncertainties and pose hypotheses regarding lake trout spawning behaviour. Our description is set within the context of an existing conceptual model that included three sequential stages to spawning behaviour—traveling, sinking, and gamete release. Spawning morphs did not overlap in time and space. Strong onshore winds seemed to trigger lake trout movement toward shoals in mid- to late-August where males outnumbered and seemed to precede female arrival at the shoals. A new behaviour termed finning was observed and interpreted as display courtship. Finning was observed at all spawning sites in Great Bear Lake and involved two or more fish that were either stationary or moving slowly just beneath the water surface with a partially erect dorsal fin, adipose fin, and only occasionally the dorsal lobe of the caudal fin breaking the water surface. On the basis of our observations and review of the literature, we propose to modify the Esteve et al. model to add (1) pre-courtship and spawning behaviour and (2) display courtship behaviour as occurring prior to traveling, sinking, and gamete release. Potential future research questions are described to address uncertainties regarding how spawning lake trout relate to their physical habitat, environmental cues to spawning, factors driving assortative mating among morphs, and the role of olfactory cues in spawning.
Reviews in Fish Biology and Fisheries – Springer Journals
Published: Mar 10, 2012
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
All the latest content is available, no embargo periods.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud