排序方式: 共有3条查询结果,搜索用时 0 毫秒
1
1.
This study presents the first observations of Hucho taimen spawning in the wild based on underwater video recordings. One pair of taimen was monitored during a 19 h period, supplemented
with visual observations from two other spawning pairs. We recorded two full spawning events performed in two different locations
separated by approximately 30 m. The absence of an established male hierarchy along a nesting female was the most important
difference between taimen and other salmonine breeding biology. Taimen spawning, based on our observations, is a single pair
event. The male prevented the approach of other males by launching intense attacks that extended for several meters away from
the redd. Our data suggests that taimen females, differently from other salmonines, do not cover their eggs immediately after
having spawned but rest for a variable number of minutes before covering them. 相似文献
2.
A video camera inside an underwater housing was used to record the spawning activities of lake trout, Salvelinus namaycush, in Kushog Lake, Ontario (Canada). Contrary to the commonly accepted belief describing lake trout as the only salmonine to
spawn exclusively at night, the recordings were taken during the day. Lake trout spawning behaviour is described in detail
and compared with other salmonine species. The loss of female “nest-building” and assumption of a novel itinerant strategy
during which females travel across the breeding grounds accompanied by a group of males, is considered to be an important
change in the evolution of the lake trout’s unique mode of spawning. 相似文献
3.
Manu Esteve Deborah Ann McLennan Mitsuru Kawahara 《Environmental Biology of Fishes》2009,85(3):265-273
A video camera mounted in an underwater housing and remotely operated was used to monitor the behaviour of five different
Sakhalin taimen (Parahucho perryi), females and attendant males spawning in three coastal tributary streams in Northern Hokkaido, Japan. Based on three complete
and two incomplete spawnings, we describe in detail for the first time the complete spawning behavioural repertoire of this
species. The Sakhalin taimen was originally placed within Hucho, then removed from that genus based on morphological, life history and molecular data. Our study supports that removal—none
of the behavioural traits we recorded clustered Parahucho with Hucho uniquely. Similarities between the two genera were all plesiomorphic traits that are widespread throughout the salmonines.
The immediate behaviour right after spawning was found to be a major difference between Hucho and Parahucho. Like female Oncorhynchus and Salmo, Sakhalin taimen females cover their eggs by beats of their tails immediately after spawning. This is different from the
“rest, then cover” behaviour shown by Siberian taimen (Hucho taimen) as well as lenok (Brachymystax lenok), supporting again that the Sakhalin taimen be removed from Hucho and placed in its own genus. 相似文献
1