yes
No animal that is female can fertilize a female. Some animals are hermaphrodites, ie, male and female at the same time. Others, such as clownfish, can change sex. However, at the time of fertilization one clownfish would be male and the other female.
This is simple. Female fish are called Lagl. It's originated from the Latin word "lagos" meaning women of the sea.This is simple. Female fish are called Lagl. It's originated from the Latin word "lagos" meaning women of the sea.
There are so many species of fish and they all differ. There are some in which there appear to be no differences and others that are so different they look like different species. If you define the species then I may be able to tell you how to sex them.
Different species have many different ways of being identified as male or female. In some there is no external difference at all.
Male fish may become more aggressive or protective to defend their mate and offspring from potential threats. Some male fish may also exhibit reproductive behaviors to attract other females to mate with. In some species, males may play no role in parenting and leave all parental care to the female.
In mammals - no. Some fish and invertebrates can pull it off though.
The answer is yes. Fish do need at least one male in the tank to fertilies the eggs. However in some cases the fish will first lay the eggs then the male will fertilize them.
no, this is not true for any species of shark, although some other fish do change sex
Different species require different methods to determine if the fish is male or female. Usually, the female is larger and rounder than the male. Some species have different shapes of fins. Some species have different colors. Without knowing what species you are trying to identify, it is difficult to give a definite answer.
An interesting one is the Nemo type "Clown or Anemone fish" where the male will change to female if the female breeder dies or goes missing. There are others like the Barramundi that are bisexual but mainly female when they are "born" and have to go out into the ocean to continue developing and growing and often change into males as adults after having layed eggs earlier in their development.
some female bears are bigger than the male bears
That all depends upon the species of fish, Some are easy to differentiate between and others are impossible to tell.