Cartilaginous Fishes - Sampling Methods

Question 1

can provide data on species occurrence

Answer 1

catch records and sightings

Question 2

• traditional methods for collecting lage samples of organisms from shallow water to the deep sea
• mainly sed on sandy or muddy bottom and is used to cover large areas

Answer 2

trawling

Question 3

wall of netting that hangs in the water column, typically made of monofilament or multifilament nylon

Answer 3

gill nets

Question 4

gill nets are typically made of what

Answer 4

monofilament or multifilament nylon

Question 5

• commercial and research fishing method
• long main fishing line with multiple baited hooks attached at intervals

Answer 5

longlines

Question 6

record the presence and behavior of cartilaginous fishes in their natural habitat

Answer 6

acoustic monitoring

Question 7

used in acoustic monitoring

Answer 7

1. hydrophones
2. acoustic tags

Question 8

helps track their movement, habitat use, and behavior over time

Answer 8

tagging studies

Question 9

different types of tags

Answer 9

1. acoustic tags
2. satellite tags
3. radio tags

Question 10

allows for non-invasive observation and identification of cartilaginous fishes in their natural environment

Answer 10

Baited Remote Underwater Video Systems (BRUVs)

Question 11

can help determine species diversity, population structure, and evolutionary relationships

Answer 11

genetic sampling

Question 12

dedicated scientific expeditions conducted to validate the presence, distribution, and population status of marine species

Answer 12

research cruises

Question 13

ecological roles

Answer 13

1. top predators
2. habitat engineers
3. carbon sequestration

Question 14

eaten by poor people living along sea coasts

Answer 14

Scoliodon

Question 15

used as an abrasive for polishing furniture, metals, etc.

Answer 15

shagreen

Question 16

believed to slow growth of brain tumors

Answer 16

squalamine

Question 17

used as exotic tools

Answer 17

shark teeth