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Fish Sampling and ID > Practical > Flashcards

Practical Flashcards

1
Q

why are fish important

A

economic and ecological facots

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2
Q

why sample id

A

propulation censuses, ecosystems

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3
Q

when moving fish to bucket you need to know how to (2)

A

CATCH AND MEASURE, ID

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4
Q

2 key approaches to id a fish

A

meristics and morphometrics

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5
Q

meristics

A

quantitative features of a fish- number of fins or scales, scales along the lateral line, gill rakers etc

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6
Q

morphometrics

A

quantitative analysis of form, a concept that is size and shape

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7
Q

KNOW ANATOMY OF FISH

A

-

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8
Q

salmonoids and trout

A

has adipose fin
silver in overall appearance in ocean phase
single short soft rayed dorsal fin

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9
Q

rockfish

A

strong spines in first dorsal fin, large scales
spines on head
large mouth
bass like

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10
Q

flatfish

A

both eyes on one side of head
distinct rayed fins

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11
Q

sharks rays and skates

A

very rough skin
several gill slits
fins w/o distinct fin rays

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12
Q

tuna and mackerel

A

series of finlets ahead of tail on bith dorsal and ventral surfaces
body is bullet shaped

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13
Q

billfish

A

super long and pointy nose

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14
Q

surf perch

A

compressed laterallt
spiny dorssal fin

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15
Q

siening

A

big net casting out and reeling in

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16
Q

dipnet

A

pole with circle net on end

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17
Q

where to measure to

A

the very end of the tail

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18
Q

pumpkinseed features

A

orange spots, no lines

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19
Q

bluegill features

A

stripes blue ish

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20
Q

golden shiner

A

yellowey uniform color

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21
Q

agnatha

A

jawless fishes

22
Q

2 groups of agnatha

A

lsmprey and hagfosh

23
Q

chondrichthyes

A

sharks, rays

24
Q

osteichthyes

A

bony fish

25
Q

characteristics of species

A

functional morphology, behavior, distribution

26
Q

fixed fishing gear

A

lift net
fyke net
hoop net
traps

27
Q

active fishing gear

A

dredge
beam trawl

28
Q

how will mobile pelagic species get caught

A

trap, mid water trawl, purse siene

29
Q

how will benthic sedentary fish get caught

A

bottom trawl

30
Q

what type of fish is caught in a bottom gillnet

A

benthic species- specific

31
Q

what type of fish is caught in a drift net

A

moving or migrating species

32
Q

what type of fish is caught in a gilnet

A

apecific species

33
Q

what type of fish is caught in a long line

A

migrating species

34
Q

what are otoliths used for for humans

A

migration, aging, elements in environment

35
Q

what are otoliths used for for fish

A

orentation

36
Q

life history of an eel

A

anadromous

born in salt, live in fresh, spawn in salt in sargasso sea

depends if they are European or north american to where they go to spawn

37
Q

survey designs

A

fixed, random, stratified random

38
Q

fixed survey design

A

same place, time, individual over time

can be biased if results don’t reflect population

39
Q

random survey design

A

equal chance of sampling any unit of the population

this can be very lengthy because you need many many observations over time to have truly unbiased sampling

40
Q

stratified random sampling

A

equal chance of sampling any unit within subsets of populations

not biased if equal differences between subsets

41
Q

if you were to do new england trawl surveys, how would you sample

A

stratified random sampling that varies by habitat and depth. beam trawl surveys

length, weight, stomach contents, isotope sampling if resources allowed.

42
Q

if you were to use a purse seine, would you bait it

A

yes or use a radar to determine where the species is

43
Q

what do you need to make sure is consistent with a beam trawl

A

EVERYTHING but specifically doors, net sizing,

44
Q

why is e-shocking good at knowing which fish are in an area, but not good at knowing the total number of species?

A

The area of sampling is unknown

it collects diverse species because it’s not biased by size, weight, or preferred habitat necessarily

45
Q

should you put metal tags in the ocean

A

no- they will rust

46
Q

advantage of clipping fins for tagging

A

small area sampling

no technology

47
Q

dart tag advantages

A

number ID to individual

when recaptured then you can see how much it grows, where it went

48
Q

PIT Tags

A

EZ pass tag

fish must pass through electrical field to be accounted for

NO battery

so small that they can be injected into most fish

NO SALT WATER!!!!!!!!!!!!!!!!!!!!!!!!!!!

49
Q

acoustic tag

A

battery inside

sends off pings that send off specified code for a fish

VERY EXPENSIVE

50
Q

RFID radiofrequency identification

A

implanting tag into organism

SURGERY

lots of $

51
Q
A

Fish Sampling and ID (1 decks)

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