sentences:  The scientific name probably covers a group of morphologically indistinguishable species, which would complicate their use as test species in substitution for "E. albidus", a species commonly cultivated in the laboratory for toxicity tests, according to OECD.For aquarists "Grindal worms" are treated as smaller relatives of whiteworms, but usually only grow to about 10 mm and thus are an ideal size for most small freshwater fishes, both adults and larger fry.Mrs.