Algae Bloom and Eating Fish with Sores

I sent some inquiries to East Bay Parks since I fish Shadow Cliff and Quarry Lakes:

Question:
Is it safe to eat fish caught at East Bay Park Lakes like Lake Chabot and Quarry Lakes when there is an algae bloom?

Answer:
So far we have seen no ill effects to fish or wildlife as a result of the algae bloom at Lake Chabot. When a similar bloom occurred at Lake Temescal last summer we tested fish for traces of mirocystin and they all tested negative for the toxin. Angler’s should be aware that some fish species, such as largemouth bass and carp, can contain traces of mercury. Hatchery fish, such as rainbow trout and channel catfish are completely safe to consume. I hope this information helps and happy fishing!
 
Joe Sullivan
Acting Fisheries Program Manager  | Fisheries 
East Bay Regional Park District


Question: Is it safe to eat Trout with sores caught at Quarry Lakes.  I caught this 22 incher.

Answer:
Thank you for your inquiry regarding the trout you caught with sores. It is hard to confirm without a picture, but based on what you described the fish may have had Lernaea on it; also known as anchor worms. These are free-swimming copepods that will attach to fish and transform into a worm-like form and feed on the flesh; sores will develop on the fish as a result. This is a common occurrence in many of the lakes in this area this time of year.  Lernaea are harmless to humans and the fish can still be consumed. We recommend cutting out the areas with larger sores, and the meat is completely safe to eat. Feel free to contact me if you have any questions. Again thank you for your inquiry and happy fishing!
 
Joe Sullivan
Resource Analyst  | Fisheries
East Bay Regional Park District

I asked the trout sore question when I fished Los Vaqueros a few weeks ago. The guy said the sores were caused by an organism that grows and falls from the newly exposed trees that are usually submerged. Also said they are safe to eat...

I filleted and ate the trout.  Never got sick.