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Quiz about Out of the Freshwater Aquarium

Out of the Freshwater Aquarium Quiz

More tough questions, mostly about our aquarium fishes in their native habitat. The answers might catch you off-guard, but they shouldn't be obscure.

A multiple-choice quiz by hawgshoes. Estimated time: 6 mins.

Author
hawgshoes

Time
6 mins

Type
Multiple Choice

Quiz #
120,108

Updated
Dec 03 21

# Qns
10

Difficulty
Difficult

Avg Score
5 / 10

Plays
1773

One at a Time - Single Page - Timed Game

Question 1 of 10

1. Aside from our familiar domesticated Betta, there are numerous wild Betta species. Though these are strictly freshwater fishes, they are now found on the islands of Sumatra and Borneo as well as on the Asian mainland Hint

because of falling and rising sea levels.

because of human interference.

because of continental drift.

because of the late Cretaceous extinctions.

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Question 2 of 10

2. "Epiphytic algae" grow on the leaves of our aquarium plants. Both in the aquarium and in natural waters, they are an essential part of Hint

the biofilm community.

the nitrifying bacteria.

the microscopic plankton.

organic detritus.

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Question 3 of 10

3. Adult fish require less protein than juveniles and can fast for days at a time without harm.

True

False

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Question 4 of 10

4. Only three species of cichlids are native to India and Sri Lanka. They are all members of the genus Etroplus but more familiar to aquarists as Hint

"Haplochromines."

"Chromides."

"Tilapia."

"Geophagus."

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Question 5 of 10

5. "Operculum" is an evocative anatomical label in describing fish, because in Latin it refers to the Hint

"working jawbone."

"throat teeth."

"little lid."

"sawtooth edge."

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Question 6 of 10

6. In 1857 a German pharmacist living in Caracas (Venezuela), who had a strong amateur interest in biology, sent some interesting unknown fishes to Berlin, where they languished in jars in a museum collection. The males and females weren't even identified as the same species. The rediscovery of these colorful fishes in 1866 is owing to a missionary named Hint

Attilio Scalare.

Martha Carnegie.

John Lechmere Guppy.

Oscar de Garcia y Astronota.

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Question 7 of 10

7. The floating bubblenest of a gourami serves to Hint

disguise the eggs as frog spawn.

keep the eggs close to a source of oxygen.

provide a floating raft for downstream dispersal of the fry.

eliminate bacteria.

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Question 8 of 10

8. Sphagnum peat is a source of beneficial tannins and helps to lower the pH of aquarium water.
True or false: Sphagnum "moss" is actually a fern.

True

False

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Question 9 of 10

9. Most fishes' eyes are all but immobile. One fish that can move its eyes almost as if it were winking, however, is a Hint

Black Ruby Barb.

Snakehead.

Corydoras catfish.

Honey Gourami.

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Question 10 of 10

10. You've decided that your community tank is too much of a mish-mash. You're going to make it a purely "Amazonian" tank. So you'll have to find a new home for your Hint

Pencilfish (Nannostomus sp.)

Severums (Heros sp.)

Spotted Headstanders (Chilodus sp.)

Black Neon Tetras (Hyphessobrycon sp.)

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Quiz Answer Key and Fun Facts

Answer: because of falling and rising sea levels.

During the Pleistocene Ice Age, as recently as 12,000 years ago, so much of earth's water was locked up in icecaps that the floor of the shallow South China Sea was exposed as a vast marshy grassland, drained by a great river system. Betta species spread into the surrounding upland rivers, then got isolated there as sea levels rose again.

2. "Epiphytic algae" grow on the leaves of our aquarium plants. Both in the aquarium and in natural waters, they are an essential part of

Answer: the biofilm community.

Biofilm covers every underwater surface. Besides algae, the biofilm community includes bacteria, yeasts and other fungi, diatoms, many kinds of single-celled protists, and minute grazing animals like rotifers and nematode worms. By contrast, the plankton community is free-swimming and drifts with water currents. Both biofilm and plankton are present in your aquarium. Detritus is merely loose decaying organic material.

3. Adult fish require less protein than juveniles and can fast for days at a time without harm.

Answer: True

During dry seasons, ichthyologists in the Amazon basin have found that, as a general rule, the larger the fish, the more likely its stomach was found to be empty.

4. Only three species of cichlids are native to India and Sri Lanka. They are all members of the genus Etroplus but more familiar to aquarists as

Answer: "Chromides."

The two familiar Etroplus species are "Orange Chromides" and "Green Chromides." "Haplochromines" designate a species flock of African Rift Lake cichlids. Tilapia from the Nile are now widely aquacultured as food fish. And all the Geophagus "earth-eaters" come from the Neotropics.

5. "Operculum" is an evocative anatomical label in describing fish, because in Latin it refers to the

Answer: "little lid."

When you're less rushed, you'll remember that the operculum is the name for the gillcover. The "little lid" is most apposite, don't you agree?

Answer: John Lechmere Guppy.

"Colorful" should have eliminated the silvery hatchetfish, Carnegiella marthae (named to honor two different ladies, in fact) and the Angelfish, or "Scalare" (from the stepwise edge of its dorsal fin). No one knows for sure which "Oscar" is the eponym, but male and female Astronotus ocellatus are frustratingly identical. I liked the concept of a missionary named for Attila the Hun, but the fish in question is the namesake of John Lechmere Guppy!

7. The floating bubblenest of a gourami serves to

Answer: keep the eggs close to a source of oxygen.

In stagnant waters that may be low in oxygen, the bubbles keep the eggs close to atmospheric oxygen and protect them from drying.

8. Sphagnum peat is a source of beneficial tannins and helps to lower the pH of aquarium water. True or false: Sphagnum "moss" is actually a fern.

Answer: False

Your first instinct was right! Sphagnum moss is truly a moss.

9. Most fishes' eyes are all but immobile. One fish that can move its eyes almost as if it were winking, however, is a

Answer: Corydoras catfish.

There are well over 130 officially described species of Cories-- not all of them available at your local fish store-- and all of them have this disconcerting habit.

10. You've decided that your community tank is too much of a mish-mash. You're going to make it a purely "Amazonian" tank. So you'll have to find a new home for your

Answer: Black Neon Tetras (Hyphessobrycon sp.)

Black Neons, Hyphessobrycon herbertaxelrodi, are fishes of the seasonally flooded Mato Grosso grasslands, to the south of Amazonia, in the separate drainage system of the Paraguay.

Source: Author hawgshoes

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