*3.4. Laslea River*

Based on the field inventory, on the Laslea River, only four refuge habitats were identified with a depth of 100–120 cm (i.e., Figure 9); the other non-refuge sectors (i.e., Figure 10) had different depths between 5 and 120 cm.

In the Laslea River, seven fish species have permanent populations: *Alburnus alburnus* (Linnaeus 1758) (total caught individuals 9), *Chondrostoma nasus* (Linnaeus 1758) (8), *Gobio gobio* (Linnaeus, 1758) (40), *Barbus meridionalis* Risso 1827 (42), *Barbatula barbatula* (Linnaeus 1758) (44), *Sabanejewia romanica* (Băcescu 1943) (60), and *Sabanejewia aurata* (De Filippi, 1863) (31).

The ratio between the number of fish between the refuge habitats of maximum 10 m in length and the adjacent/downstream non-refuge sectors of 500 m length was 12 to 1.

**Figure 9.** Laslea River refuge habitat.

**Figure 10.** Laslea River non-refuge sector.

Refuge habitats are rarely present on two-thirds of the lower and middle parts of the river, and should be extended to the upper part of it and also multiplied so that at every 500 m there is at least one.

Given the general depth of the Laslea River and the vulnerabilities that occur for fish during periods of drought, it is proposed to build artificial refuges for fish from about 500 to 500 m. In total, it would be necessary to build a number of 37 such refuges with a depth of at least one meter (Scheme 4).
