Our results and observations of lamprey migration behavior confirm that pool and weir fishways and design features common to other fishways types can pose a substantial obstacle to Pacific Lamprey migration.
Finally, past work by Keefer et al. (2009, 2013a) has noted an important interaction between the size of lamprey and migration behavior, in that relatively large-bodied Pacific lamprey typically arrive earlier at Bonneville Dam and travel further upstream than small-bodied lamprey in the same year.
By analyzing singly substituted human and hagfish insulin analogues, we show that a small number of residues explain the aberrant behavior of hagfish and lamprey insulins.
In human insulin, as mentioned earlier, single mutations at this position to Ala or Ser are sufficient to reduce the affinity ∼3-fold and to induce the peculiar binding behavior seen in hagfish, lamprey, and hystricomorph insulins.
We evaluated the behavior and capabilities of upstream migrating adult Pacific Lamprey using a series of experimental trials in relation to existing and novel fishway designs using Passive Integrated Transponder PITtelemetrytelemetry
In the sea lamprey, the gene expression pattern observed in this study may be related to its sexually dimorphic behavior.
Olfactory cues and the relevant behaviors have been identified in various fishes; these cues include migratory pheromone in sea lamprey (Sorensen et al. 2005), priming pheromone in goldfish (Dulka et al. 1987), and male-attracting pheromone in masu salmon (Yambe et al. 2006).
In this work, we have re-examined the binding behavior and biological properties of hagfish insulin as well as that of insulin from the river lamprey (L. fluviatilis).
Alternatively, large-bodied Pacific lamprey may return to upstream sites because of some olfactory cue, as such cues have been demonstrated to influence migration behavior in Pacific lamprey (Yun et al. 2011) and other lamprey species (e.g., Petromyzon marinus; attractants, Li et al. 2002; and repellents, Wagner et al. 2011).
