Sea-floor ecosystems. Trawling's a drag for marine life, say studies.
Malakoff
David
D
D000818:Animals; D037421:Anthozoa; D003247:Conservation of Natural Resources; D017753:Ecosystem; D004777:Environment; D005398:Fisheries; D005399:Fishes; D019015:Geologic Sediments; D007221:Industry; D008386:Marine Biology; D011161:Porifera; D012623:Seawater