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Ecotoxicological information

Toxicity to birds

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There is no indication of any hazard of slag to birds, and it has been shown that slags do not exhibit any relevant effect on aquatic or terrestrial organisms. Consequently, no measurements have been done with birds.
In a field study with slags on herring, it was observed coincidently that gulls feed indicriminately on eggs, larvae and adult herrings in control natural rock fields (basalt, granite, and diabase) as well as in slag fields.

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Additional information

No study designed to measure the toxicity of slags on birds was performed. However, there are some coincidental observations from another field study suggesting that slags do not negatively affect birds.

A field study was conducted in the Nord-Ostsee-Channel to elucidate the effects of stones of slag and natural rock on the reproduction of the herring, Clupea harengus.

The channel is a significant spawning ground of herring, and every year approximately 15 millions of adult fish enter the channel for reproduction. Billions of eggs are deposited in the channel above the stone fields, and attach to the stones and the filamentous algae growing on these stones.

These eggs and the newly hatched fish larvae are indiscriminately eaten by gulls, and form for some period of the year the feed for large gull flocks which systematically harvest the eggs and larvae in a water depth of up to 40 cm.