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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
Gopher rockfishSebastes carnatus
SCAR
Blue rockfishSebastes mystinus
SMYS
Kelp rockfishSebastes atrovirens
SATR
Olive rockfishSebastes serranoides
SSER
Black rockfishSebastes melanops
SMEL
Pile surfperchDamalichthys vacca
DVAC
Striped surfperchEmbiotoca lateralis
ELAT
Rubberlip surfperchRhacochilus toxotes
RTOX
Copper rockfishSebastes caurinus
SCAU
Black and Yellow rockfishSebastes chrysomelas
SCHR
Black surfperchEmbiotoca jacksoni
EJAC
Kelp surfperchBrachyistius frenatus
BFRE
Rainbow surfperchHypsurus caryi
HCAR
Painted greenlingOxylebius pictus
OPIC
Sizing fish underwater
1. Total length
2. Aids to sizing fish
3. Factors that contribute to over or underestimation
4. Exercises: Dive schedule
1. Total length
Total lengthTarget accuracy ± 10%
2. Aids to sizing fish
1. Slate marks
2. Transect tape marks
3. Hand measurements
4. Bracketing
5. Comparative approach
6. Recalibration during dive
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
Questions?
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
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
Exercise 1 layout
Paragon
Beach
Rocks
Kelp bed
North
4 transects
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
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
Questions?