In the legend of Zelda how can I make the water dragon's to open the gate after I kill the fish

Fish caught in the fishing minigame can't be put into bottles, instead, head to Zora's Domain, in the shallow water near the waterfall there's some fish you can catch with a bottle, just equip the bottle and 'attack' the fish with it. Alternatively, you can buy fish for 200 rupees.

Make sure you have the fishing rod first. The cat will be hanging around the pond behind one of the houses, it wants to catch a fish for the shopkeeper. Start fishing there, once you catch the second fish press B and the cat will steal it and run off back to the shopkeeper. Then go and talk to the shop keeper, she will give you a bottle of milk and then you are able to purchase the slingshot. Hope this helps :)

Kill the Worm Chu and then use the Clawshot on the spot found on the ceiling to
open a hole directly below you. Descend with the Clawshot safely on the
platform below and open the chest containing the Big Key. If you want to, you
can fish for Skullfish and small Loaches here, but you can't record any of the
Skullfish since they are a forbidden fish.

Fire Arrows and lob Water Bombs in the water to kill off the Skullfish and then
jump in once the coast is clear.

Simply place it in the water and pull when it goes downwards

there is 2 keys 1 is on the first floor 1is through a rooom on the second floor i know it works because i did the same thing

Do you remember the room where you get to a door by Claw shoting to a vine then another then a third? Enter the room I'm discribeing at the lower level and claw shot your way across(make sure the wheels are spinning). When you go in the door, jump in the water and make your way to a crack at the bottom of the water. After you go through the crack head right and swim up to a under water bomb rock guarded by a fish that blows up. Hold Z on him and grab him with the Claw Shot. When he's in your clutches throw it at the bomb and go through the hole. Now go down and you'll notice another bomb rock. Blow it up to find ****. Kill it and go up to find a door. Go through the door and aim up with the claw shot. Lower your self through the newly open hole to find the Boss Key chest. Now go through the door in the water quickly to ovoid the fishes to end up in a tunnel. Go through killing the Bari with the claw shot to find yourslf back at the section where the second bomb rock was. Work your way back to the room with the stairs to fight the boss. As an extra go to th 2nd floor in that room and aim your claw shot at the medallians at the celing. A chest with a Heart piece awaits. Now go to the first floor and travel west(left according to the map) and make the water flow through the door with the stairs. Go through the door and go on the floating bridge. Defeat the lizard and use the claw shot to get the last heart piece in that temple.

Do you remember the room where you get to a door by Claw shoting to a vine then another then a third? Enter the room I'm discribeing at the lower level and claw shot your way across(make sure the wheels are spinning). When you go in the door, jump in the water and make your way to a crack at the bottom of the water. After you go through the crack head right and swim up to a under water bomb rock guarded by a fish that blows up. Hold Z on him and grab him with the Claw Shot. When he's in your clutches throw it at the bomb and go through the hole. Now go down and you'll notice another bomb rock. Blow it up to find ****. Kill it and go up to find a door. Go through the door and aim up with the claw shot. Lower your self through the newly open hole to find the Boss Key chest. Now go through the door in the water quickly to ovoid the fishes to end up in a tunnel. Go through killing the Bari with the claw shot to find yourslf back at the section where the second bomb rock was. Work your way back to the room with the stairs to fight the boss. As an extra go to th 2nd floor in that room and aim your claw shot at the medallians at the celing. A chest with a Heart piece awaits. Now go to the first floor and travel west(left according to the map) and make the water flow through the door with the stairs. Go through the door and go on the floating bridge. Defeat the lizard and use the claw shot to get the last heart piece in that temple.

Whereabouts are you? What are you up to?

If you mean the gate with the Twilight Bulbins on the other side turn on your senses and dig.

i think i know where you are in the game if i don't sorry and im only doing this by memory because i haven't played the game in ages. look on the ground there should ba a pattern use the boomerang Z target the 4 pillers in that order then release and the gate should open