Differentiating between species

Question 1

What defines a Spring Chinook?

Answer 1

Big ocean migration, precocious males, return in spring, interior stocks, 1 or more years in FW.
1.1 to 1.5, or 3/2 to 6/2

Question 2

What defines a Fall Chinooks?

Answer 2

Also known as Ocean Type, remain inshore, continental shelf, coastal. Return in the fall, do not have precocious males. migrate to sea 3 months after emergence from gravel.
0.1 to 0.4, or 2/1 to 5/1

Question 3

What species is most likely to be confused with Steelhead?

Answer 3

Salmo salar

Question 4

What distinguishes Steelhead from Atlantic?

Answer 4

Steelhead: spotted tail, no spots on operculum.
Atlantic: no tail spots, 3 dots on operculum

Question 5

How does Atlantic differentiate from Brown?

Answer 5

ATL:

1) More streamlined shape
2) Narrow peduncle
3) Slightly Forked tail
4) maxilla iffy past eye
5) Few spots beyond lateral line

Question 6

How do you tell an Atlantic Juve from a Brown Juve?

Answer 6

ATL: long pec fins (till dorsal fin), red dots, CLEAR ADIPOSE.
BWN: short pec fins, red dots, ORANGE ADIPOSE

Question 7

Clarki: distinguishing characteristics (Adult)

Answer 7

• black spots on back, flanks, dorsal and caudal fins
• teeth on shaft of vomer (salvelinus don’t)
• low # anal rays (t) (easiest way to decipher)

Question 8

Clarki: distinguishing characteristics (Juve)

Answer 8

• Black spots on tail
• melanophores btwn rays
• jaws to/behind eye margin
• red/yellow markes under jaw

Question 9

Juve Clarki from RBT

Answer 9

clarki:

1) Caudal melanophores in lines (rbt evenly distributed)
2) mid dorsla parrs absent (rbt=dorsal parts present)
3) white dorsal tip = 3)
4) HYROID TEETH PRESENT (rbt=hyroid teeth absent)

Question 10

Difference between Clarki clarki and Clarki lewisii

Answer 10

clarki clarki is heavily spotted, clarki lewisii has few flank spots.

Question 11

how do you tell apart anadromous and resident species of Cutthroat trout (at 115-120mm)?

Answer 11

CUTTING them open! mature or no?

Question 12

What is the difference between summer and winter run steelhead?

Answer 12

winter are mostly coastal, summer are mostly interior

Question 13

Whats the big difference between sockeye and chum juves?

Answer 13

gill rakers

Question 14

Distinguishing characteristics of Chummers

Answer 14

white on white mouth, NO JACKS, YO!

Question 15

Distinguishing characteristics of Chummy Juves

Answer 15

parrs more on the regular than sockeye, crazy big eyes, short and stubby gill rakers.

Question 16

How do you distinguish Pink juves from other fish?

Answer 16

No parrs, like coregonus and stenodus

Question 17

Where do odd and even year pinks mostly come from?

Answer 17

odds: mostly come from puget sound
even: mostly Gwaii to Alaska

Question 18

How do you tell Nerka Juves apart from coho and chum?

Answer 18

There is no greenish sheen on Nerka

Question 19

Why might Nerkas have such large eyes?

Answer 19

Diel vertical migration

Question 20

What are the other names for ‘Progenies’?

Answer 20

Parents, Escapement

Question 21

What is the other name for ‘Recruit’?

Answer 21

Spawners