Exodus 7:17 Thus saith the Lord, In this thou shalt know that I am the Lord: behold, I will smite with the rod that is in mine hand upon the waters which are in the river, and they shall be turned to blood. 18 And the fish that is in the river shall die, and the river shall stink; and the Egyptians shall loathe to drink of the water of the river.
The fish was worshipped as a god, as was also the frog, by the name Heqa. In fact, one of the reasons why God shook down Dagon in the temple of the philistines is because they had cloned the fish with a human body, to produce what we now know as the little mermaid. And the list goes on and on.
[Patriarchs & Prophets pp 586] The Philistines removed the ark in triumph to Ashdod, one of their five principal cities, and placed it in the house of their god Dagon. They imagined that the power which had hitherto attended the ark would be theirs, and that this, united with the power of Dagon, would render them invincible.
But upon entering the temple on the following day, they beheld a sight which filled them with consternation. Dagon had fallen upon his face to the earth before the ark of Jehovah. The priests reverently lifted the idol and restored it to its place.
1st Samuel 5: 2 When the Philistines took the ark of God, they brought it into the house of Dagon, and set it by Dagon. 3 And when they of Ashdod arose early on the morrow, behold, Dagon was fallen upon his face to the earth before the ark of the Lord. And they took Dagon, and set him in his place again.
May God add His blessing to the study of His word. “Good night” and God bless!