The Broadfin Reef Squid is found throughout tropical shorelines, all round the Pacific. Sepioteuthis is the fastest growing of any invertebrate species, up to 600grams in half a year. They are also very short lived, seldom exceeding 300 days.
Females lay tethered egg capsules with about five to ten eggs per capsule. Adults guard the eggs and display quite aggressive behaviour towards any species that approach the beds of communally laid eggs, attached to bottom rocks or secure weed or old coral.
The nerve axons of these squid are used extensively in biomedical research. Their capsules contain up to ten or so eggs, but the first embryo to hatch goes round killing and eating the remaining eggs or younger siblings in that same capsule. These Squid feed mainly on shrimps and prawns of several species.
