[Would You Eat This Blackfish?]

Here's some good info based on science.

Parasites in Marine Fishes

How long should I cook fish to kill parasites?

Cooking fish to an internal temperature of 140°F will kill all fish nematodes and tapeworms. Normal cooking procedures generally exceed this temperature.

140°F is 60°C. So quite easy to make safe by cooking.

Interesting they say that bacterial contamination is more of a worry than stuff you can see like worms

The health risk from parasites is far less than the risk from "unseen" illness causing bacteria which are present on almost all foods.

Hope that helps

William

[Would You Eat This Blackfish?]

It sure doesn't look pretty - and quite off-putting. But if you cut the tainted/ugly bits off and COOK the fillet there is absolutely nothing to worry about.

There are some fish parasites that can be transmitted to humans - but they are definitely killed by cooking.

[Can Anyone Please Explain-Tidal Movement]

There are a number of factors that influence how fast the water moves such as water depth, size of river mouth even direction of the wind and wind speed.

Good question and excellent answer. Add the those factors already mentioned the actual size of the tide on the day as well as the amount of fresh water (non-tidal) coming down the river due to rain in the catchment.

Basically when you're inside the mouth of an estuary, in the tidal zone, the water will still be running downhill beyond the precise time when sea-level starts to rise at the mouth. The closer you get to the mouth, the shorter the lag will be.

And to complicate things, during the smallest neap tides the far upper reaches of the tidal zone may not even get any incoming flow at all.