Not enough information. Is Janet a marine biologist? Did she cite her source? Why is the friend even asking Janet in the first place? Everyone hands out advice and opinions all the time. But some things we say with a shrug, and others we assert with confidence. If I tell you that, "The salmon pâté is fine, as far as I know, but I never touch the stuff, have you seen the cups?" it's really not my fault when Death shows up for you.