Chyornyj Prud is the 7th region in Metal Gear Solid 3 Delta: Snake Eater.
Collectibles Overview:
Chyornyj Prud
Trophy: 
Mud Scientist – Equip the Scientist camo, roll through the mud at the shore of the lake with 
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and crawl through the mud with 
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until the trophy unlocks.
Snake D (Coral Snake) – Upon entering the area you can find this moving around the right side just before the water. This looks almost identical to Snake E. A red pattern snake.
Snake E (Milk Snake) – Upon entering the area you can find this moving around the left side just before the water. This looks almost identical to Snake D. A red pattern snake.
Weapon (WP Grenade) – On the left side at the start of the area, in shallow water at the shore. Also found in many other locations and from shaking down guards.
Frog A (Otton Frog) – Swimming around in the shallow water near the shore on the left. Looks like a gray frog.
Frog C (Poison Dart Frog) – Swimming around in the shallow water near the shore in the middle. Looks like a red frog with blue legs. (you can also find Frog B “Tree Frog” here which we already collected at start of the game, don’t confuse it with the other frogs)
Fish C (Arowana) – In the central and west side of the area, in the deeper water. Must kill it so it turns into an item pickup, eat its meat.
Ga-Ko #12 – To left of the north-east exit which has the tripwire trap, there is a tree with a rope on it leading to an item, it’s sitting on a branch from this tree.
Kerotan #12 – Underwater at the base of the same tree below the Ga-Ko. Dive to see it.
Camo (GA-KO) – To the right of the north-east exit, in some shallow water.
NEXT: Bolshaya Past
For an overview of all regions and collectibles by type, refer to Metal Gear Solid 3 Delta: Snake Eater Collectible Guide.
PaleVoyager says
If you take the other exit back into Chyornyj Prud from Bolshaya Past South, or swim under the northwest area, you can access an area where you can hang shimmy across wires to a Croc Cap item.