Fishes Class Actinopterygii Flashcards

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Questions and Answers

What class do ray-finned bony fishes belong to?

Class Actinopterygii

What are the defining characteristics of Osteichthyes?

Live only in saltwater

Largest and most diverse group of vertebrates (correct)

Bony fish (correct)

Have a swim bladder or lungs (correct)

What type of caudal fin is found in Class Actinopterygii?

Homocercal caudal fin

What does the operculum do in Class Actinopterygii?

Facilitates water movement over the gills Signup and view all the answers

What is the purpose of the swim bladder in Actinopterygii?

Buoyancy device used to float in the water Signup and view all the answers

Which of the following are types of scales found in Class Actinopterygii? (Select all that apply)

Ctenoid scales Signup and view all the answers

Name a few examples of ray-finned fishes.

Sunfish, catfish, perch, bass Signup and view all the answers

What are myomeres?

Blocks of skeletal muscle tissue found commonly in chordates Signup and view all the answers

How do freshwater and saltwater fish regulate osmosis?

Freshwater fish excrete diluted urine. Signup and view all the answers

Most fishes in Class Actinopterygii are viviparous.

False Signup and view all the answers

What is alevin?

Larva with a yolk sac Signup and view all the answers

What are the three types of reproduction in Class Actinopterygii?

Oviparous Signup and view all the answers

Describe the life cycle stages of Class Actinopterygii.

Eggs hatch, alevin, fry, adult Signup and view all the answers

Parental care is common among fish in Class Actinopterygii.

False Signup and view all the answers

What is bioluminescence used for in certain Actinopterygii species?

Communication, schooling, and courtship Signup and view all the answers

What is electroreception?

Detection of electrical fields Signup and view all the answers

What is the dilution effect in fish?

Protection from predators by joining a group Signup and view all the answers

What characterizes schooling behavior in fish?

A group swimming together in a coordinated manner Signup and view all the answers

What is aggregation in the context of fish?

Any collection of fish gathered in a locality Signup and view all the answers

Study Notes

Class Actinopterygii Overview

Comprises ray-finned bony fishes, a diverse vertebrate group.
Includes all bony fish with a swim bladder or lungs, found in marine and freshwater environments.

Osteichthyes

Represents the largest vertebrate group, includes all bony fish.

Caudal Fin

Characterized by a homocercal shape, ensuring balanced movement in water.

Operculum

Bony structure covering gills, aids in water movement for respiration.

Swim Bladder

Acts as a buoyancy regulation device, allowing fish to maintain their position in water.

Types of Scales

Fishes have ganoid, cycloid, and ctenoid scales, which are thin, flexible, and overlapping for protection.

Representative Species

Examples of ray-finned fishes include sunfish, catfish, perch, and bass.

Myomeres

Skeletal muscle blocks with zig-zag, "W" or "V"-shaped fibers, contributing to coordinated movement.

Osmoregulation

Freshwater fish absorb water through the skin and excrete dilute urine.
Saltwater fish primarily lose water through skin, excreting concentrated, salty urine.

Reproductive Strategies

Generally dioecious with external fertilization; includes various methods such as oviparous, viviparous, and ovoviviparous.

Life Cycle

Progresses through stages: eggs hatch into alevin with a yolk sac, then into fry after yolk absorption, and finally to adult fish.

Sex Reversal

Genetic control plays a role in sex determination, influenced by environmental conditions like temperature and social dynamics.

Parental Care

Most species exhibit little to no parental care, though some may construct nests or carry developing embryos.

Bioluminescence

Utilized by deep-sea species like lanternfishes for communication, schooling, and courtship in dark waters.

Electroreception

Ability to detect electrical fields through structures like the lateral line, aiding in navigation and prey detection.

Electrogeneration

Some species, like electric eels, employ specialized muscles near the caudal fin to produce electrical currents for defense and hunting.

Dilution Effect

A survival strategy where individuals in a larger group reduce their chance of predation, as the likelihood of being targeted decreases.

Schooling Behavior

Refers to fish that swim together in a coordinated manner, providing benefits such as protection and increased foraging efficiency.

Fish Aggregations

General term for fish groups that gather in one locality, which can be structured (specific organization) or unstructured (random clustering around resources).

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Description

Test your knowledge on Class Actinopterygii with these flashcards. Learn about ray-finned bony fishes, their characteristics, and classifications. Ideal for students looking to deepen their understanding of this diverse group of vertebrates.