Class Agnatha
This class is also known as this
What is Jawless Fish
Class Chondrichthyes can also be called this
What is cartilaginous fish, meaning these fish lack true bones
Class Osteichthyes can also be called this and why
They can also be called "Bony Fish" because they have true bones
These surface pigment cells expand and contract to produce various colors
What is Chromatophores
Why do fishes school? (2 reasons)
Most fish school for protection but some fish school to round up prey
Members from class Agnatha are characterized by features they don't have, name two
What are: jaws, scales, paired fins, true bones
Species in this class have the following features (name 2)
What are: lack true bones, have paired fins, have moveable jaws and defined teeth, Placoid scales (rough sandpaper skin made of the same stuff teeth are made of)
Species in this class have what special features (name 2)
What are: true bones, operculum, paired fins, scales, swim bladder, a terminal mouth
A fish has a large, dark spot near its tail. Is this an example of cryptic coloration, disruptive coloration, or warning coloration?
What is disruptive coloration
When a fish moves from one location to another location regularly, whether daily, yearly, or life cycle, it is called this
What is migration
There are only two species in the class Agnatha, they are what two species?
What are Hagfish and Lampreys
The reason why sharks have spiral intestines and what does the spiral intestine help with?
What is: because sharks have large livers to help with buoyancy and lack a swim bladder they have a spiral intestine. The spiral intestine increases surface space to help with digestion.
This special feature on bony fish ensures that water flows across the gills to maximize the amount of oxygen that gets into the capillaries of the gills
What is an operculum
A certain fish has a tapered body shape and is dark gray on the dorsal side of its body and light silver on its ventral side. What can you determine about this fish and what is this coloring called?
What is its shape and coloration clue us in that it is probably a fast open-water swimmer disguised by its countershading, possibly a shark.
When a fish migrates from freshwater to the ocean to reproduce, it's called this, and an example would be...
What is catadromous and an example are eels, they move from freshwater to the Sargasso sea to reproduce
With no jaws, this is how species in this class are able to feed
This special opening on some cartilaginous fish is used to take in water and ventilate the gills, even while the animal may be feeding or at rest on the bottom
What are spiracles
What is a swim bladder, the fish is able to control the amount of gas in the swim bladder to either go up or down in the water column
A fish has a tapered body shape, is it a fast-moving predator, a demersal fish, a slow-moving reef swimmer, or does it live in narrow crevices in rocks?
What is it most likely is a fast-moving predator. The torpedo shape makes the fish streamlined and easier to catch prey.
When a fish hatch in freshwater, move to the ocean as adults and then return to freshwater to reproduce, it's called this, and an example would be...
What is Anadromous and an example is Salmon
Lampreys hatch in freshwater and move to marine waters as adults but return to freshwaters to reproduce, this is called what?
What is Anadromous
Rays are designed perfectly for their demersal lifestyle, meaning they live on the bottom of the ocean. Name 2 characteristics helpful for their demersal lifestyle.
What are: they are flat, their mouths are ventrally located convenient for feeding, their eyes and spiracles are on the dorsal side, making it easy to see and breath
This specialized system of blood flow in the gills of fishes allows the gills to obtain the maximum amount of oxygen from the water via diffusion
What is the countercurrent system
How can fish feel the presence of things in the water around them?
They have something called a lateral line along their bodies that are sensitive to vibrations and pressure changes in the water. Sharks have an extra sense, using the ampullae of Lorenzini, sharks are able to detect electrical currents to help with hunting prey.
A fish produces only a few eggs for fertilization, is this fish most likely oviparous or ovoviviparous?
What is Ovoviviparous, since the an oviparous fish lays lots of eggs so that at least a few hatch.