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How to catch Achondrostoma arcasii

Achondrostoma arcasii (Steindachner, 1866)

About Achondrostoma arcasii fishing

Achondrostoma arcasii is a small freshwater ray-finned fish belonging to the family Leuciscidae, endemic to the northern and northeastern river basins of the Iberian Peninsula. It typically reaches a common length of around fifteen centimetres while achieving a maximum total length of twenty-five centimetres. The species is characterised by a fusiform, streamlined body, an obtuse rounded snout, and a distinct scale count along its lateral line. It inhabits clear mountain streams, middle river reaches, upland lakes, and reservoirs, where juveniles frequent shallow, slow-flowing margins before migrating to deeper, swifter waters in midsummer. As an opportunistic feeder, it primarily targets benthic aquatic invertebrates, detritus, and plant matter. Spawning occurs during the late spring months of May and June. Due to habitat degradation, pollution, and the introduction of invasive species, populations face increasing environmental pressures across its restricted native range.

  • Difficulty

    Medium

  • Average size

    15 cm TL

  • Habitat

    Freshwater

  • Season

    Spring, Summer, Autumn

Achondrostoma arcasii

Caudal shape

Forked caudal fin shape typical of the species.

Lateral stripe

A dark midlateral stripe runs along the flank.

Achondrostoma arcasii fishing facts

Characteristics

  • Typical size

    15 cm TL (max 25 cm TL )

  • Typical weight

    0.2 kg (max 0.2 kg )

  • Longevity

    11.1 years

  • Body shape

    Fusiform / Normal

  • Vulnerability score

    34.7

Best hours

  • Dawn

    First light

    Low

  • Morning

    After sunrise

    Peak

  • Midday

    High sun

    Active

  • Afternoon

    Late day

    Peak

  • Dusk

    Last light

    Low

  • Night

    After dark

    Low

When to fish for Achondrostoma arcasii

01
January
02
February
03
March
04
April
05
May
06
June
07
July
08
August
09
September
10 Now
October
11
November
12
December

How to catch Achondrostoma arcasii

Tips for catching Achondrostoma arcasii

Anglers targeting this small Iberian endemic typically employ light freshwater tactics focused around shallow margins, slow-flowing river stretches, and upland reservoirs during the warmer daylight hours. Float fishing and precision pole presentations using fine tackle and small natural baits such as river invertebrates or bread punches prove effective for tempting opportunistic feeders. Fly anglers can also experience success by presenting tiny wet flies or nymphs imitating aquatic macroinvertebrates in clear riffles and runs. The most productive fishing occurs during late spring and summer when the fish are active across accessible reaches, though care should be taken to respect local conservation regulations due to their vulnerable status.

Best equipment to catch Achondrostoma arcasii

Compare fishing methods for Achondrostoma arcasii — sized kit for each technique.

Note: Typical fish is 0.2 kg Our algorithm will suggest the best equipment for you based on this weight.

Best lures and baits for Achondrostoma arcasii

Ranked lures and natural baits from every method, best first.

How Achondrostoma arcasii migrates — Potamodromous

Migrates within rivers and lakes only. Fish upstream runs and seasonal lake movements, not saltwater.

How Achondrostoma arcasii migrates — Potamodromous 1. Eggs: Laid on gravel or weed upstream or in flooded shallows. 2. Larvae: Fry drift or swim down to slower water. 3. Adults: Feed in the main river or lake. 4. Spawners: Move upstream or into the shallows to spawn.
Upstream Main river or lake

1 Eggs

Upstream

Laid on gravel or weed upstream or in flooded shallows.

2 Larvae

→ Main river or lake

Fry drift or swim down to slower water.

3 Adults

Main river or lake

Feed in the main river or lake.

4 Spawners

→ Upstream

Move upstream or into the shallows to spawn.

The whole cycle stays in fresh water.

Hover or tap a number to read each stage.

Diet and behavior of Achondrostoma arcasii

  • Diet

    Carnivore

  • Feeds by

    Hunts animals

  • Hunts

    Morning · Afternoon

Where Achondrostoma arcasii lives

Lives near the bottom but swims in the water just above it. Cover the lower column, not only the mud.

Habitats
Freshwater
Depth zone
Depth not recorded
Water column
Benthopelagic
Just above the bed

Where this species lives