Fish terminology: Carrying Capacity | Caudal Fin | Claspers | Cavity Spawners | Chromatophore


Welcome to new fish terminology series.
In today’s episode, we’ll be looking at fish terms beginning with the letter C The first term, which is commonly used in
aquaculture studies is carrying capacity We know the word capacity means the maximum
amount that something can hold but what about carrying capacity? This term is famously used in population biology
that refers to the maximal load of the environment. meaning, how much is the maximum population
of the animal could be kept in one cultured environment
with the provided food, space, and other necessities available without leaving significant impact. In aquaculture, carrying capacity could be
a tool to promote sustainable aquaculture by considering 4 important factors; physical,
production, ecological and social impacts. The second terminology is caudal fin.
This is the fin, which is located at the back or similar to tail. In fish, it is the only fin that is connected to the vertebral column used for moving.
Caudal fin is important factor to understand the locomotion dynamics in fish.
Compared to other animals who use their tails in ups and down motion,
fish move around using their caudal fin with side to side thrust for propulsion. The shapes of caudal fin also differ between each species For example, some species, like tuna who require fast acceleration but least manoeuvring have lunate or moon crescent shape fin, while predators species, like grouper who wait and hunt, have wide, round and strong caudal fin, best for maneuvering. The third terminology is claspers. This refers to the external reproduction organ found on male shark, rays and chimaeras It is design to deliver sperm into the female cloaca, another term refer to the female sexual organ Sharks have a pair of claspers, which extend from their pelvic fins They have two claspers since they have two pelvic fins. In order to produce offspring, shark must
fertilised their egg internally, Interestingly, they only use one clasper at
a time to transport the sperm into the female. The fourth terminology is cavity spawners
refers to fish that lay eggs in cavity. These types of species are egg depositor,
normally laying eggs near the pond substrate or tank but within a cavity such as cave or crevices along the pond banks Species like suckermouth catfish are common type of cavity spawners. Finally, the last terminology is chromatophore which refers to the dermal cell that contain pigment and gives colour to the fish.
Apparently, chromatophore occur in most animals from amphibians, crustaceans, and reptiles
It can be grouped into different subclasses according to colours such as erythrophores
(red), xanthophores (yellow), leucophores (white), melanophores (black/brown), cyanophores (blue) and iridophores (reflective/iridescent). Some species have the ability to camouflage,
by shifting the pigments and reflective plates within chromatophore. Transparency is one of the method for camouflage. In the ocean, animal with transparency looks such as plankton and jellyfish will be invisible by their predators in shallow water.
Thanks to the chromatophore That’s all five terminology that you should
know beginning with the letter C If you like this video, please like and subscribe
to our channel Until then, thank you for watching and see
you next time.

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