The Aare river is 288 km in length and originates in the Aar glacier in the Grimsel area. At Koblenz it flows into the Rhine river. One usually finds catfish, crayfish, pikes and in the lower part of the river sometimes eels. It is to mention that according to Binnenschifffahrtsverordnung (BSV), Artikel 77 it is forbidden to dive in the waterways, harbours and anchor points.
Fig. 1: A small crayfish (Orsonectes limosus) between lots of zebra mussels (Dreissena polymorpha). Both species were introduced. The crayfish from North America and the zebra mussel from the Black Sea. — EXIF: Nikon D200; Δt=1/250 s; f=20 mm; f/8.0; ISO 100; 2009-09-16 19:49:24
Fig. 2: A northern pike (Esox lucius) laying on the sandy floor taking a nap until I woke it up with my camera flash. — EXIF: Nikon D200; Δt=1/320 s; f=22 mm; f/7.1; ISO 100; 2009-09-16 20:18:58
Fig. 3: Yet another pike (Esox lucius) lying on a bunch of algae. Or is it the same as from the previous picture? I don't remember. Can you see the little fish in the background hiding from its predator? — EXIF: Nikon D200; Δt=1/320 s; f=24 mm; f/8.0; ISO 100; 2009-09-16 20:20:08
Fig. 4: The northern pike (Esox lucius) eye in eye with an european perch (Perca fuviatilis). Probably both were blinded by my light and the pike didn't see the perch. Or the pike was sleeping. At least it is possible to take pictures of a pike during night. At day they are usually too shy. — EXIF: Nikon D200; Δt=1/320 s; f=24 mm; f/8.0; ISO 100; 2009-09-16 20:23:51
Fig. 5: Small fishes and a strobe reflex in the upper left corner. Next time I have to position it further back. — EXIF: Nikon D200; Δt=1/250 s; f=24 mm; f/8.0; ISO 100; 2009-09-16 20:34:32
Fig. 6: A small crayfish (Orsonectes limosus) and a big diver with flashlight in the background. After I zoomed out to take another picture, both were already gone. — EXIF: Nikon D200; Δt=1/250 s; f=22 mm; f/8.0; ISO 100; 2009-09-16 20:44:26
Fig. 7: A northern pike (Esox lucius) just woke up after taking. The small pikes are not as shy as the big ones ... or the brave ones never get that old. That picture is much better than the previous ones in this album four years ago. Isn't it? It's made with the same camera and lens but two smaller strobes than one big. They can be better aligned and illuminate less backscatter. — EXIF: Nikon D200; Δt=1/250 s; f=24 mm; f/8.0; ISO 200; 2013-09-08 18:59:45
Fig. 8: The same northern pike (Esox lucius). It was remarkably patient and allowed taking multiple pictures. Usually they are gone after just one shot and leave only a dust cloud. — EXIF: Nikon D200; Δt=1/250 s; f=24 mm; f/11.0; ISO 200; 2013-09-08 19:00:29
Fig. 9: Crayfish (Orsonectes limosus) — EXIF: Nikon D200; Δt=1/250 s; f=24 mm; f/5.6; ISO 200; 2013-10-04 20:33:35
Fig. 10: Catfish ( Silurus glanis) — EXIF: Nikon D200; Δt=1/250 s; f=24 mm; f/5.6; ISO 200; 2013-10-04 20:40:16
Fig. 11: Catfish (Silurus glanis) — EXIF: Nikon D200; Δt=1/250 s; f=24 mm; f/5.6; ISO 200; 2013-10-04 20:40:18
Fig. 12: Barbel alte (Barbus barbus) with deformated back. — EXIF: Nikon D200; Δt=1/250 s; f=24 mm; f/5.6; ISO 200; 2013-10-04 20:44:33
Fig. 13: A european perch is lying on the sand dunes at the bottom of river Aare. — EXIF: Nikon D200; Δt=1/250 s; f=24 mm; f/5.6; ISO 200; 2013-10-04 20:55:41
Fig. 14: Northern pike (Esox lucius) taking a nap on the sandy river ground. — EXIF: Nikon D200; Δt=1/250 s; f=24 mm; f/5.6; ISO 200; 2013-10-04 21:00:13
Fig. 15: Northern pike (Esox lucius) on sand ground. I couldn't get a picture from the front. The pike was already gone after this picture. — EXIF: Nikon D200; Δt=1/250 s; f=24 mm; f/5.6; ISO 200; 2013-10-04 21:00:42
Fig. 16: At last a european crayfish (Astacus astacus)! They have become very rare. Unfortunately they are going to be replaced by the american crayfish. — EXIF: Nikon D200; Δt=1/250 s; f=24 mm; f/5.6; ISO 200; 2013-10-04 21:02:13
Fig. 17: European perch (Perca fuviatilis) lying on sandy bottom. — EXIF: Nikon D200; Δt=1/250 s; f=24 mm; f/5.6; ISO 200; 2013-10-04 21:04:58
Fig. 18: A european perch (Perca fuviatilis) lying on the ground with a bunch of algae. — EXIF: Nikon D200; Δt=1/250 s; f=24 mm; f/5.6; ISO 200; 2013-10-04 21:16:38
Fig. 19: Two empty clamshells. It was just a test shot for the right camera settings, but despite of some caddisfly larvae there was nothing more interesting on this dive site. Dive #645: Swimming bath Brugg, Aare. — EXIF: Nikon D200; Δt=1/250 s; f=105 mm; f/22.0; ISO 200; 2018-05-04 9:15:55
Fig. 20: The larva of a Caddisfly (lat. Trichoptera) is living under water and builds a tube from various little pieces that it finds. It uses it for hiding and protection. Unfortunately there was nothing more interesting on this dive site at river Aare near the open air swimming pool at Brugg. The maximum depth there is about four meters. Dive #645: Swimming bath Brugg, Aare. — EXIF: Nikon D200; Δt=1/250 s; f=105 mm; f/22.0; ISO 400; 2018-05-04 9:37:36
Fig. 21: The larva of a Caddisfly (lat. Trichoptera) is living under water and builds a tube from various little pieces that it finds. It uses it for hiding and protection. Unfortunately there was nothing more interesting on this dive site at river Aare near the open air swimming pool at Brugg. The maximum depth there is about four meters. Dive #645: Swimming bath Brugg, Aare. — EXIF: Nikon D200; Δt=1/250 s; f=105 mm; f/18.0; ISO 400; 2018-05-04 9:40:56
