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:

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Presentation transcript:

Today’s schedule : Revision - fish identification : Fish sizing (lecture room) : Brief/dive - Fish identification : Lunch : Brief/dive - fish sizing

Gopher rockfish Sebastes carnatus SCAR

Blue rockfish Sebastes mystinus SMYS

Kelp rockfish Sebastes atrovirens SATR

Olive rockfish Sebastes serranoides SSER

Black rockfish Sebastes melanops SMEL

Pile surfperch Damalichthys vacca DVAC

Striped surfperch Embiotoca lateralis ELAT

Rubberlip surfperch Rhacochilus toxotes RTOX

Copper rockfish Sebastes caurinus SCAU

Black and Yellow rockfish Sebastes chrysomelas SCHR

Black surfperch Embiotoca jacksoni EJAC

Kelp surfperch Brachyistius frenatus BFRE

Rainbow surfperch Hypsurus caryi HCAR

Painted greenling Oxylebius 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 length Target 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 in 2. Dive procedures - ascent rate 10m/min - deep-shallow - maintain dive team 3. Communications: pay phone (lab), cell phone & VHF Ch 16 (Paragon) 4. First Aid & Oxygen - Shore and Paragon 5. Evacuation plan: Lighthouse - left on Forest - Highway 68 - few miles on Pacific Grove, CHOMP

Questions?