File:Brook Lampreys nesting - Lampetra planeri 3.jpg
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DescriptionBrook Lampreys nesting - Lampetra planeri 3.jpg |
A profound joy to see these wonderful creatures. Five European Brook Lampreys - Lampetra planeri. They have a fascinating life cycle. The blind hatchlings float down stream and embed themselves in burrows in silt where they spend about three to seven years maturing, filtering organic material for food. When ready, they metamorphose into sighted adults and emerge from their burrows. This happens in the autumn. From then till early spring they live a secretive life, swimming upstream by night and hiding under stones by day. Once they've reached a suitable gravel spawning ground, in small groups they build a nest - a shallow depression in the stream bed. They build the nest by moving stones, lifting them with their round sucker-like mouths. They are able to move stones twice their body weight. Spawning happens in daylight in March or April, once the water temperature reaches about 10C. The females attach themselves to stones with their suckers and the males squirm vigorously, releasing sperm. Females release their eggs in a cloud which attach to stones in the nest, hatching within the month. Each female lays about 1,500 eggs. After spawning the lampreys die. Adult Brook Lampreys are unable to feed so they gradually loose weight during their journey upstream. I sat entranced and watched eggs being fertilised and lampreys carefully moving small stones into the nesting pool and rearranging them. Two days later there wasn't a sign of the creatures, though the nest they'd made was still visible if you knew what to look for. The little stripy predatory fish I’d seen at the start was back at the spot. |
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Date | |||
Source | Flickr: Brook Lampreys nesting - Lampetra planeri 3 | ||
Author | Sarah | ||
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current | 06:32, 19 October 2017 | ![]() | 3,648 × 2,736 (4.98 MB) | VortBot (talk | contribs) | Uploading higher resolution from Flickr |
16:27, 7 May 2011 | ![]() | 1,024 × 768 (383 KB) | Flickr upload bot (talk | contribs) | Uploaded from http://flickr.com/photo/50834689@N04/5559897680 using Flickr upload bot |
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Camera manufacturer | Panasonic |
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Camera model | DMC-TZ6 |
Exposure time | 1/50 sec (0.02) |
F-number | f/4.9 |
ISO speed rating | 400 |
Date and time of data generation | 15:37, 11 March 2011 |
Lens focal length | 49.2 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Ver.1.2 |
File change date and time | 15:37, 11 March 2011 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.21 |
Date and time of digitizing | 15:37, 11 March 2011 |
Meaning of each component |
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APEX exposure bias | 0 |
Maximum land aperture | 3.44 APEX (f/3.29) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
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