00:01
Can ask about the perch fertilized its egg externally and leave them exposed to rocks.
00:08
The guppy fertilized egg internally can be burst into live young.
00:11
Which fish produce fewer egg? so from there you can see that the guppy typically produce fewer egg.
00:33
And let's talk about why in the question asking you to compare a survival rate of these two species.
00:40
So since perch produce egg and then fertilize it externally, though this means that the eggs are exposed to many environmental risks, and then many eggs may die due to low survival rate.
01:51
So basically, perch eggs have much lower survival rate because they have the environmental risk.
01:58
And therefore, they must increase the number of eggs to increase the chance of some surviving.
02:32
So, so example, perch produced 100 eggs and maybe five of them can survive.
02:38
So they basically compensate the low survival rate with a higher amount of egg being produced.
02:47
On the other hand, gupi produced much less because they fertilize the egg internally.
02:56
So when you fertilize it internally, the survival rate of each offspring must be higher because they are protected until birth.
03:36
So gupi has a lot higher survival rate.
03:40
So as a result, gupi does not need to produce a lot of eggs because live young are more likely to develop or survive due to the most.
03:55
Mother's body protection.
03:58
The internal fertilization basically reduced the vulnerability of the young to predators right after the birth.
04:08
So this is why gupi does not need to produce a lot of eggs.
04:34
So as you can see, gopi produced fewer eggs because they protect those eggs until they are older.
04:43
So from there, you can see that perch produced much more eggs than gutbeed due to the way they fertilize.
04:52
The second question asked about the function of swim bladder in perch.
04:56
The swim bladder is a gas fuel organ that helps the fish maintain buoyancy in water.
05:46
So adjusting the volume of gas in the swimming bladder could have to let the fish control its position and water volume, allow it to flow, rise, or sink without expanding energy in swimming...