Why are the large mystery sea creatures unclear ?
817223
Maybe because the sea is so big, very big, unimaginably big that we don't know as much about the oceans as we do about the surface of the Moon. There is so much we don't know about the sea because we are not designed for this environment
1071274
You have fish in inverted commas, does that mean you are unsure?  Did it have eyes, a mouth, gills?  Was it a vertebrate? The first thing I thought of was a sea slug or flatworm.  A sea slug seems more likely in a Carribean coral reef.
1094620
Because they are quite vicious predators in the ocean.  They don't just kill everything they see, and they're not known to kill humans, but they are definitely at the top of their food chain.  The Sea World info on them says, "they are the largest predator of warm-blooded animals ever known.  Fishes, squids, seals, sea lions, walruses, birds, sea turtles, otters, penguins, cetaceans (both mysticete and odontocete) [[this means dolphins and other whales]], polar bears, reptiles, and even a moose -- they have all been found in the stomach contents of killer whales."  Have you ever seen a video of an orca killing a seal?  If you have, you'll understand why someone would call them a killer whale.  In one video I've seen, it was almost like a cat playing with its prey.  If not, the link below has a video.
116994
Well, the second coelacanth species, Latimeria menadoensis, was discovered in 1997.\nIt is large, and it's also significant because it belongs to a very old group (one of the "living fossils").\n\nThe megamouth shark (Megachasma pelagios) is another really large fish that was recently discovered (1976). Only about 25 specimens are known.
659956
We have catalogued an estimated less than half the species out there- And once catalogued, we don't have an active system to determine populations of most species.  Thus, we are in the dark about what species are there, how many there are in the population, etc.  GIven that, we have only vague guesses about the number of species lost.  In a similar vein, we assume new species are being born each year, or at least each decade, but since we don't know what species were there before, we certainly can't tell if a species is newly evolved, or is just one we have never seen before.
37114
Most sea monsters like Loc Ness are only myths that started long ago to explain odd happenings. But there are lagre creature that do ocupy the ocean and other deep bodies of waters. There are Giant Squids (Architeuthis dux)and other creatures that have adapted to live deep in the oceans. Usually the can live in high pressure and low light conditions and are generally not too cute looking in you are interested you could try this web site http://www.extremescience.com/deepcreat.htm
401295
I recall hearing about this before... I think it has something to do with the pressure differences between the captive tank and the natural lower depth environment the whale is meant to live in.\n\nGood question!
771201
It is not possible that man knows everything so there is a strong possibility that these creatures do exist. I certainly hope so any way.
123576
How could someone name oceanlife animals if they themselves don't know? Do you mean rare species? I am not very sure but search it on the internet. Happy Valentine's Day!
635766
Even the answer is not clear!
861659
This question is unclear.
752007
the question is unclear
1162144
LochNess..........there are so many underwater wonders we are totally unaware of.........\n\nGINORMOUS ANIMAL WONDERS we will never know........so whose to say theres no LochNess OR mermaids ?!?!\n\nThe world may never know :)
482324
One of the arguments would be the lack of fossils for intermediate species. As there are many fish and reptiles fossils discovered, shouldn't there be at least some half fish-half reptile fossils as well?
409085
Whales(the blue whale)are the largest mammals.As to why they are,it cannot be answered!Why is the world round?
343039
It is actually a large sea bird.  For more info, please go here: http://www.aolsvc.worldbook.aol.com/wb/Article?id=ar010920&sc=-1
588153
This is going way back for me, but I thought that most crustaceans you had to actually dissect them before you could tell.  Sorry, I might be thinking of another class of animals.  I remember learning the answer to your question way back in junior high.