Can some one explain what this means...

12. ECOLOGICAL INFORMATION

Biodegradability 0% after 28 days (got this part)
Acute fish toxicity LC0 > 1,000 mg/l (96 hrs.)
Toxicity for daphnia EC 50 > 1,000 mg/l (24 hrs.)
Acute bacteria toxicity EC 50 > 100 mg/l (3 hrs.)