The life cycle of an octopus has four stages- egg, larva, juvenile, and adult. It is a unique under-sea life cycle where the male dies within a few months of mating and the female dies soon after hatching of the eggs.
An octopus is a soft-bodied, eight-armed marine creature which falls under Class Cephalopoda under Order Octopoda. The size of octopus varies spending on its genus. The size of the smallest octopus is around 5 cm in length while the size of the largest octopus is around 6 meters in length. The main features of octopus include a pouch-like huge head, which is slightly separated from the body, compound eyes and eight arms. A tissue, known as the skirt attaches the arms and each arm is made up of two rows of powerful fleshy suckers.
Reproduction, or for that matter, mating is quite a serious business for octopi the very first reason being only one per cent of around 200,000 eggs an adult octopus lay gets to survive and reach adulthood. Depending on the species, an octopus generally lives up to three to five years. They grow rapidly. Study shows, a young octopus can grow by five per cent every day, thanks to their amazing metabolic rate. Upon reaching maturity they start to reproduce.
Each pair of male and female octopus produces only one batch of young and then dies. It’s like reproduction is the only purpose of their life. The male octopus, as stated earlier, dies usually after a few months of mating, while the female just lives to see the eggs hatching (which usually takes ten months); and after nurturing the eggs, it dies.
The life cycle of octopus is divided into four stages namely, the Egg (stage 1), the Larva (stage 2), the Juvenile (stage 3) and the Adult (stage 4). The four stages of the life cycle of octopus are discussed vividly in the following paragraphs:
Octopi lay eggs after fertilization. The size of the eggs measures up to 0.3 cm in length. A common form of octopus such as O. Vulgaris has the ability to lay more than 10,000 eggs and the eggs are laid in small holes and under rocks. The eggs are cleaned on a regular basis with the help of the suckers until the hatching of the eggs. Female octopus saves the eggs with her life during this stage.
The hatching of eggs is done by the larval octopus after four to eight weeks of the development. The newborn larval octopi are all on their way. The newly emerged larval octopi are called octopods. They look like adult octopi and stay at the surface of the ocean. At the initial stage, octopods drift in the plankton for a long span of time before entering into the bottom of the ocean. At this stage, octopods are fed by larval crabs, larval starfish and larval lobsters. Octopods stay on plankton for a long period of time and they are fed on it in frequent manner. These larvae swim down to the bottom of the ocean after a certain point of time.
The juvenile octopi begin to develop at a rapid pace during this stage. The weight of juvenile octopus is increased by 5 per cent every day because of its constant feeding habits. At the last stage of the life cycle of the octopus, the weight of the octopus is one-third as much as the food it has taken. The larval octopus may enter the adult stage of its life if the circumstances are suitable. This happens because of the small life expectancy of the octopus.
Octopi are sexually mature and ready to mate when the octopi enter into this stage. A modified arm known as hectocotylus is used by the male octopus to release sperms into the mantle cavity of the female octopus. The male octopi die after a few months of mating. After hatching of the eggs the female octopus also dies. Sperms can be stored for several weeks after mating by the certain species of octopi.
The octopus bears the following characteristics:
Octopi are categorized as predators and they attack their prey by dropping down on them and enclosing it with their arms. As a result, the prey is pulled into their beaks and broken up. The beak of the octopus is similar with the beak of the parrot.
Octopus is rich with a brilliant sense of touch, powerful beak-like jaws and venomous saliva. They are able taste what they are touching with the help of the receptors in the suckers.
A very significant characteristic of the octopus is its ability to squeeze itself into surprisingly small cracks and crevices. The soft body and dearth of internal skeleton are the reasons behind this.
There are three hearts in an octopus; two of them pumps blood to the gills and blood is circulated to the rest of the body by the third heart.
Octopus has blue coloured blood. The presence of haemocyanin makes the blood of the octopus blue.
Octopi can swim very fast. But generally, they prefer to crawl instead of swimming because the systemic heart becomes inactive and stops circulating blood to its organs at the time of swimming and thus they become very exhausted.
The life span of the octopus is very small. Some of the species of octopus survive only for six months. The life span of a giant octopus is about five to six years.
Most commonly, the octopi live at the bottom of the ocean. But sometimes they are also found on the surface of water drifting alongside planktons. They feed on large fishes, seals and whales.
The octopus is considered as a brainiac among the invertebrates. A number of researches have been conducted on the intelligence of this sea creature. However, a lot more remains there to be studied. Nevertheless, the life cycle of octopus has a huge significance as it provides an insight into the life of oceanic invertebrates.
1. Where Do The Octopi Live And What Is The Eating Habit Of The Octopus?
Octopi are located in all the water bodies of the world. Generally, they are found in warm, tropical water. They can be seen near the shorelines, in open oceans and on the floor of the ocean. Different categories of octopi are fed by different food items. octopi in the open ocean are fed by prawns and other small fishes. Worms are eaten by the bottom-dwelling octopi.
2. Can Octopi Survive Without Water?
Octopi cannot survive without water like other marine animals. If the octopus is left without the water it can only survive for a couple of minutes and then die.
3. What Are The Other Interesting Facts About The Octopus?
I. The size of octopi generally differs. The range of size and weight of the octopus is from 12 to 36 inches in length and 3 to 10 kilograms in weight respectively. As per the recent report of National Geographically, the gigantic octopi are found in the Pacific Ocean. The weight of the giant octopi ranges between 50 kg to 272 kg and 30 feet in length.
II. One of the most interesting facts about octopus is they possess very good camouflage. The body colour of the octopus can be altered by them to match their surroundings in a whisker of time.
III. octopi are venomous creatures. According to the research the venom is not made by them but the symbiotic bacteria produce it. The most venomous octopus is a blue-ringed octopus and they can kill human beings.
IV. Octopus is considered as one of the most highly intelligent marine species. This is because of the fact that they possess the largest brain and equipped with a complete and well developed central nervous system. There are almost 500 million neurons are found in its arms which help them to touch, taste and grip their prey.
V. As per the recent researches octopi can learn very quickly. Their observation power is very close to that of human beings. Octopi can learn by observing the other octopi.
4. How Do The Octopi Escape From Their Prey?
Octopi can escape from their prey with the help of some tools. A dark cloudy, ink-like liquid is shot by the octopus to its attackers which make them temporarily blind and confused. This gives the valuable time to the octopus that it can escape.