today’s schedule 1.0830: revision - fish identification 2.0900: fish sizing (lecture room) 3.0930:...
TRANSCRIPT
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Today’s schedule
1. 0830: Revision - fish identification
2. 0900: Fish sizing (lecture room)
3. 0930: Brief/dive - Fish identification
4. 1200: Lunch
5. 1330-1700: Brief/dive - fish sizing
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Gopher rockfishSebastes carnatus
SCAR
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Blue rockfishSebastes mystinus
SMYS
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Kelp rockfishSebastes atrovirens
SATR
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Olive rockfishSebastes serranoides
SSER
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Black rockfishSebastes melanops
SMEL
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Pile surfperchDamalichthys vacca
DVAC
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Striped surfperchEmbiotoca lateralis
ELAT
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Rubberlip surfperchRhacochilus toxotes
RTOX
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Copper rockfishSebastes caurinus
SCAU
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Black and Yellow rockfishSebastes chrysomelas
SCHR
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Black surfperchEmbiotoca jacksoni
EJAC
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Kelp surfperchBrachyistius frenatus
BFRE
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Rainbow surfperchHypsurus caryi
HCAR
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Painted greenlingOxylebius pictus
OPIC
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Sizing fish underwater
1. Total length
2. Aids to sizing fish
3. Factors that contribute to over or underestimation
4. Exercises: Dive schedule
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1. Total length
Total lengthTarget accuracy ± 10%
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2. Aids to sizing fish
1. Slate marks
2. Transect tape marks
3. Hand measurements
4. Bracketing
5. Comparative approach
6. Recalibration during dive
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3. Factors that contribute to under and overestimation of size
1. Low light
2. Dull body color
3. Poor visibility
4. Objects in foreground
5. Deep-bodied fish
Underestimation Overestimation
1. Bright light
2. Bright body color
3. Good visibility
4. Objects in background
5. Elongate fish
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Questions?
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Today’s dive program
Morning - Fish identification - Materials: Slate, fish cheat sheet, YOY flowchart - Work in groups (to be allocated) - Swim to Paragon - Dive: identify all species on cheat sheet list - 1 Tank only
Afternoon - Fish sizing - Materials: Slate, data sheet, fish cheat sheet - Work in pairs (to be allocated), within 2 streams - Swim to Paragon - Dive: Carry out 2 fish sizing exercises - 2 Tanks - change at Paragon
Timings: Dive to be terminated by set time
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Fish sizing exercises
1. Sizing fish models - Work in pairs - Swim to Paragon - Descend anchor line - Locate transect lines - Swim transect lines, sizing fish from 2-3 m away, record size, move closer, measure fish, record actual size - Carry out this exercise for all 4 transects
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Exercise 1 layout
Paragon
Beach
Rocks
Kelp bed
North
4 transects
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Fish sizing exercises
1. Sizing fish models
2. Sizing live fish - Work in pairs - Swim to Paragon - Descend anchor line - Identify and size fish encountered (and anything else that gets in your way) - Compare notes
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Dive safety brief
1. Dive log - sign out and in2. Dive procedures - ascent rate 10m/min - deep-shallow - maintain dive team3. Communications: pay phone (lab), cell phone & VHF Ch 16 (Paragon)4. First Aid & Oxygen - Shore and Paragon5. Evacuation plan: Lighthouse - left on Forest - Highway 68 - few miles on Pacific Grove, CHOMP
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Questions?