swordtip squid

The Swordtip Squid possesses bilateral symmetry along with large lens eyes on each side of their head, along with 8 arms and 2 tentacles. They are one of few species that possess photophores under their inks sacks, which led to their earlier taxonomic classification in the subgenus Photololigo. The male Swordtip squid tends can grow up to 65 cm, while the females can grow up to 40 cm. This can vary based upon changes to their environment. The mantle length of adult females tends to be in the 20-30 cm range, while the male's mantle length is between 30-40 cm. Most of the squids that are caught commercially have mantle lengths that are 15-25 cm long. Depending on environmental factors such as temperature change, the growth for these squids can change. Growth can be tracked from the growth rings on their statoliths. The squids possess fins on the mantle around 70% of their length. These larger fins are used for steering and stability, along with propulsion at slower speeds in more contained areas such as rocks and reefs. These squids possess sexual dimorphism in regards to their beak size and shape. It has been found that the upper beak is slightly larger than the lower beak, as they are split into two. The females have a larger upper beak in the mature stages of their growth because they develop faster than the males. …

The Swordtip squid is distributed throughout the Western Pacific Ocean, mostly near Eastern Asia. It can be found in northern regions such as the southern part of the Sea of Japan and the East China Sea, along with more tropical regions like the coasts of Thailand, Indonesia, and Malaysia. They have been documented in Northern Australian waters, but has been disproved by recent studies looking at the distribution of squid species around Australia. They are typically found within the eastern Tsushima Strait in regards to commercial fishing. Their migration patterns can be assessed by the small growths of the statolith, which can differ depending on the season they decide to migrate. Recent studies have showed that the squids found off of the coast of Australia are not actually the Swordtip squid, even though they had been previously documented. They are found in shallow waters because that is where they tend to spawn. This can be anywhere from 30 m to 100 m below surface level. With most of their prey being within these depths, they tend to stay between those depths because they have access to their biological needs like feeding and reproducing.

The Swordtip squid is a migratory species, as they travel to certain areas to reproduce. The main seasons that they spawn are in spring and autumn, but the species will spawn in each season. According to statolith measurements, scientists are able to infer the migratory routes of the Swordtip squid. The eggs will hatch all year long, but the mature squids will die after spawning. Before the point of reproduction, this squid is quite solitary. When the time comes to reproduce, the males will perform mating rituals to attract the females for spawning. As for feeding, juveniles tend to eat crustaceans such as crabs and shrimp. The adult squids feed on crustaceans, but also fish and other squids. It has been found that Swordtip squid near Japan possess a larger growth rate when they hatch in a warmer season such as summer or winter. Water temperature is a large factor that contributes to the growth of this squid, but it also shortens the life expectancy of the squid. This is because of the amount of energy that is needed to grow faster. Since they reach sexual maturity more quickly, they will die quicker as they are reproducing earlier than usual. The larger the female squids become, the greater fecundity they possess. This is because there is a correlation between mantle size and the amount of eggs that are able to be carried in the ovaries. …