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Presumably this is a female ninespine stickleback

 

The smallest among our sticklebacks, the length of a year-old fish little more than 3 centimetres, older specimens up to 6-7 centimetres. Body shape is lanceolate, mouth  upwards-turned and a markedly narrow caudal peduncle (tail stem). There are generally 9 spines in front of the back fin that can be upright or lie along the back. In front of the pelvic fin a movable spine. The back colour of ninespine sticklebacks can be quite varying and the bars starting from the back can reach to the edge of the belly. The body has no scales but the caudal peduncle is covered by little bony plates – a quite good protective armour.

 

The little fish feed on what they can catch: from zooplankton to newly hatched fish fry. They also hunt for roe; they cannot manage to rob the spawning nests of brown trout that are covered with gravel but if any corn of roe has been washed out it becomes the prey of the stickleback.

 

On Thursday  morning at 10 o’clock there was a power cut and at the restart of the video camera it turned out that the HDMI lead too was defective and needed replacement. Just before 5 o’clock the camera was working again. One and a half hours later the brown trout that had been disturbed by our doings were in place again. The camera position needs some adjustment on Friday.

 

The ninespine stickleback in camera view were recorded by Aita, LK forum