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The Quillfish has an extremely elongate, slender body with lon-based tall dorsal and anal fins which make the fish similar in shape to the primary feather of a bird or a quill pen. The small head is only between 4 and 7% of the length of the body and there is a wide fleshy appendage at the front of the lower jaw.
The quillback rockfish (Sebastes maliger), also known as the quillback seaperch, is a species of marine ray-finned fish belonging to the subfamily Sebastinae, the rockfishes, part of the family Scorpaenidae. This species primarily dwells in salt water reefs. The average adult weighs 2–7 pounds (0.9 – 3 kg) and may reach 1 m (3 feet) in length.
A bigmouth buffalo (top) compared to a quillback (bottom). Both of these species are long-lived catostomids [3] [5] The quillback is a slow-paced and long-lived freshwater fish species that belongs to a subfamily (Ictiobinae) for which extremely long-lived fishes are becoming known.
The differences in life span between species demonstrate the role of genetics in determining maximum life span ("rate of aging"). The records (in years) are these: for common house mouse, 4 [29] for Brown rat, 3.8 [30] for dogs, 29 (See List of longest-living dogs) [31]
All together, there are 1,270 species of killifish, the biggest family being Rivulidae, containing more than 320 species. [2] As an adaptation to living in ephemeral waters, the eggs of most killifish can survive periods of partial dehydration.
Aristotle (ca. 340 B.C.) may have been the first scientist to speculate on the use of hard parts of fishes to determine age, stating in Historica Animalium that “the age of a scaly fish may be told by the size and hardness of its scales.” [4] However, it was not until the development of the microscope that more detailed studies were performed on the structure of scales. [5]
There is a dispute based on the taxonomy of the sailfish, and either one or two species have been recognized. [3] [4] No differences have been found in mtDNA, morphometrics or meristics between the two supposed species and most authorities now only recognize a single species, Istiophorus platypterus, found in warmer oceans around the world.
Silverjaw minnows have a typical life span of three to four years. [10] Eggs hatch between late spring and late summer. [10] Growth of fish in their second and third summers occurs from May or June to the end of July. [10] Growth stops during the fall and winter months due to a slowed metabolic rate. [10]