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The first shark-like chondrichthyans appeared in the oceans 400 million years ago, [1] developing into the crown group of sharks by the Early Jurassic. [2] Listed below are extant species of shark. Sharks are spread across 512 described and 23 undescribed species in eight orders. The families and genera within the orders are listed in ...
[7] Another problem aquarists keeping sharks with other types of fish have encountered is that the smaller, more passive aquarium-friendly shark species often have difficulty competing with their tankmates for the food provided by the aquarist. [7] Sharks are predatory themselves and may maul or consume tankmates smaller or weaker than ...
The largest species, called simply the nurse shark Ginglymostoma cirratum, may reach a length of 4.3 m (14 ft); the tawny nurse shark Nebrius ferrugineus is somewhat smaller at 3.2 m (10 ft), and the short-tail nurse shark Pseudoginglymostoma brevicaudatum is by far the smallest at just 75 cm (2.46 ft) in length. The first of the three species ...
Most of the full-time fish – more than half of which are on the IUCN Red List of threatened species – are of the smaller variety. But sharks of great size are not uncommon off these shores ...
This species of hammerhead shark is the most recently discovered out of the ten species. It was documented by Carter Gilbert in 1967 when a specimen was caught off Charleston, SC.
Niamh Ní Dhrisceoil is used to seeing all types of sea life in her job as a skipper of the Cape Clear Ferry in County Cork, Ireland. However, Niamh was stunned and delighted by the sight of a ...
There are numerous species of sharks found in the Pacific Ocean; of these sharks, 36 [1] have habitat ranges throughout the coastlines and surrounding waters of California, as identified below. Identifications include common names; scientific names; the taxonomic rank, family; conservation statuses according to IUCN; and an image.
Rising demands for shark products has increased pressure on shark fisheries, but little monitoring or management occurs of most fisheries. [7] Major declines in shark stocks have been recorded over the past few decades; some species had declined over 90% and population declines of 70% were not unusual by 1998. [8]