Spawning period and migration of three species of cyprinids in a stream with Mediterranean regimen (SW Spain)

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Abstract
From February to June 1989, we examined the spawning period and migration of the Iberian barbel (Barbus sclateri), Iberian nase (Chondrostoma polylepis willkommii), and mirror carp (Cyprinus carpio var. specularis) from an upstream reservoir on a river, which has a Mediterranean regimen (SW Spain). Intensive electrofishing and tagging experiments revealed a tendency in this species to use a tributary to spawn.Barbel migration started in late March‐early April, when they gathered in discrete groups to abandon the reservoir. The barbel spawned in the Indiano dam (a major obstacle to upstream‐migrating fish). Mass immigration occurred in mid‐May. The emigration of Iberian nase began in mid‐late March (not reaching the dam) and ended in late May. The carp migration began in early March, they spawned next to the dam and immigrated in late May‐early June. Our results support the hypothesis that water temperature is the major factor that controls migration in these species.

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