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AN INVESTIGATION INTO THE NATURE OF ANAL FIN GLANDS IN FISHES OF THE FAMILY BLENNIIDAE
Title
AN INVESTIGATION INTO THE NATURE OF ANAL FIN GLANDS IN FISHES OF THE FAMILY BLENNIIDAE.
Creator
Porter, Marianne C., Florida Atlantic University
Abstract/Description
Sexually active males of the family Blenniidae develop distinctive glandular swellings of the anal fins. These glands can be divided into four groups on the basis of their shape and whether they appear on the anal fin spines or rays or both. Examples of each group, when studied microscopically, show the same histological pattern. This pattern includes three layers of tissue, the outermost of which contains characteristic barrel-shaped groupings of cells called "microglands". These anal fin...
Show moreSexually active males of the family Blenniidae develop distinctive glandular swellings of the anal fins. These glands can be divided into four groups on the basis of their shape and whether they appear on the anal fin spines or rays or both. Examples of each group, when studied microscopically, show the same histological pattern. This pattern includes three layers of tissue, the outermost of which contains characteristic barrel-shaped groupings of cells called "microglands". These anal fin glands are compared histologically to similar structures on the dorsal fins of some blenniids and the anal fins of certain clinids. The microscopic structure of the anal fin glands is distinctive and characteristic.
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Date Issued
1979
PURL
http://purl.flvc.org/fcla/dt/13962
Subject Headings
Blenniidae, Fins (Anatomy)
Format
Document (PDF)
A Comparative Study on the Tensile Properties of Shark Skin
Title
A Comparative Study on the Tensile Properties of Shark Skin.
Creator
Creager, Shelby, Porter, Marianne C., Florida Atlantic University, Charles E. Schmidt College of Science, Department of Biological Sciences
Abstract/Description
Our goal was to assess regional differences in denticle density and skin tensile properties in four coastal species of shark. We hypothesized that the denticle density, tensile strength (MPa), stiffness (MPa), and toughness of skin (MJ·m^-3) would vary regionally along the body of an individual and among species. An hourglass-shaped punch was used to extract the skin samples at 10 anatomical landmarks and denticle density was quantified. Denticle density varied significantly among both...
Show moreOur goal was to assess regional differences in denticle density and skin tensile properties in four coastal species of shark. We hypothesized that the denticle density, tensile strength (MPa), stiffness (MPa), and toughness of skin (MJ·m^-3) would vary regionally along the body of an individual and among species. An hourglass-shaped punch was used to extract the skin samples at 10 anatomical landmarks and denticle density was quantified. Denticle density varied significantly among both regions and species, and showed a significant species by region interaction. Skin samples were tested in tension at a strain rate of 2 mm-s until failure. We found significant species and region effects for all tensile and denticle density properties. Also, denticle density increases with skin stiffness but decreases with toughness. Shark skin toughness is similar to that of mammalian tendons. These data show shark skin functions as an exotendon, able to conserve energy during swimming.
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Date Issued
2016
PURL
http://purl.flvc.org/fau/fd/FA00004761, http://purl.flvc.org/fau/fd/FA00004761
Subject Headings
Sharks--Anatomy., Sharks--Locomotion., Surfaces (Physics), Biophysics.
Format
Document (PDF)