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Dorsal Fin Classification System
For the Ten Thousand Island Dolphin Study we have adopted a classification system that closely
mirrors that developed by The Mid-Atlantic Dolphin Study catalogue.
Under this system, the number assigned to each dorsal fin is based on the following criteria:
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1000 series
T
TYPICAL
- Fins with a “Typical”, intact shape
- no distinctive characteristics
- not identifiable
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2000 series
LD
LEAD
-leading edge of fin has a distinctive notch, nick or slice
-LD is ranked above all other categories: fins with distinctive features on the leading edge
are placed in LD regardless of other features
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3000 series
MT
MISSING TOP/TIP
- missing a large portion of the fin tip
-- MT is ranked above all other categories except LD; even if there are other
features, the MT takes precedence over all other categories
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4000 series
TN
TIP NICK
- tip of fin has nick, notch or scoop
- TN is ranked above all other categories except LD & MT.
- TN takes precedence over all other trailing edge features.
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5000 series
RB
RIGHT BEND
- fin is canted or bent to the right
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6000 series
LB
LEFT BEND
- fin is canted or bent to the left
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7000 series
ENT
ENTIRE
- each third of the trailing edge has equally distinctive features
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8000 series
UP
UPPER THIRD
- upper third of trailing edge has the most distinctive feature
- When there are equally distinctive features in more than
one third of the trailing edge, the location of the lower
feature takes precedence over the higher feature.
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9000 series
MID
MIDDLE THIRD
- middle third of the trailing edge has the most distinctive feature.
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10000 series
LOW
LOWER THIRD
- lower third of the trailing edge has the most distinctive feature.
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11000 series
ET
EXTENDED TIP
- Tip of fin extends past remainder of the trailing edge
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12000 series
M
MISC
- most prominent feature is located somewhere other than on the dorsal fin: the body, flukes, back etc.
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13000 series
PED
PENDUNCLE NOTCH
- most distinctive feature of the dolphin is on the peduncle
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