Today’s schedule 1.0830: Revision - fish identification 2.0900: Fish sizing (lecture room) 3.0930:...

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?