question: How do pet fish not get bored in such small tanks? What, if anything, do they do for entertainment?
comment: They do get bored, but you are a fish, what can you do other than exist and procreate, I think that being in the sea or in the bowl don't change that much, it's not like they go around and visit the sea, they are a little bit more concerned about surviving so we are doing them a favour,
passages: Another advantage of these devices is that electronic fish feeders may also be used to feed amphibians, if they are kept in glass cages. 
   Aquarium fish feeder
  
  Aquarium fish feeders are electric or electronic devices that are designed to feed aquarium fish at regular intervals. They are often used to feed fish when the aquarist is on vacation or is too busy to maintain a regular feeding schedule.
  
  Section::::Design.
   Goldfish are curious fish that will quickly become bored without items or other fish to interact with. If placed in a bare aquarium, goldfish will settle to the bottom and only move when fed or frightened by sudden jolts. However, if put in a tank with sufficient gravel, aquarium accessories or plants (real or fake) they will make themselves at home.
   Section::::In the aquarium.:Feeding.
  
  These fish will primarily feed on algae and vegetable laden wafers or tablets; though they might accept worms or such meatier fare, they do not do well on this type of diet. It is quite difficult to get a right balance in feeding these species because of their herbivorous preference.
  
  Section::::In the aquarium.:Breeding.
   Section::::Uses.:Toys.
   Pacu are commonly sold as "vegetarian piranhas" to home aquarium owners. With the proper equipment and commitment, pacu have been known to make responsive pets. One such example was Swish, a 75-cm (30-inch) pacu owned for over 20 years by a Chinese restaurant (Kau Kau) in the Chinatown district in Seattle, Washington; one aquarium technician said of Swish, "He'd rub his body on your arms, kind of like a dog."
   Section::::Fishkeeping industry.:Animal welfare.
  
  Fish are sometimes maintained in inadequate conditions by inexperienced aquarists who often keep too many fish in one tank, or add fish too quickly into an immature aquarium, killing many of them. This has given the hobby a bad reputation among some animal welfare groups, such as PETA, who accuse aquarists of treating aquarium fish as cheap toys to be replaced when they die.
   Another concern of aquarists is overeating. Fish are not to be given too much food. It is estimated that fish should be given as much as they can eat in 3 to 5 minutes, and once a day. However, the electronic fish feeders prevent overeating by releasing the right quantity of food, at scheduled times. This way, aquarists who have to get away for few days do not have to ask their neighbours or friends to come over and take care of their pets. It is often impossible to find a reliable person available and willing to do such a favor. The electronic fish feeders are therefore a solution for fish keepers who own aquariums and which ensure that the pets are fed in a healthy way and on schedule.
   The benefits of electronic aquarium feeders are not only that the fish are fed when the aquarist is not at home, but they are also helpful in maintaining the fish' health. Because they are feeding small portions of food at scheduled intervals and precise feedings at appropriate times, the automatic feeders can be successfully used to feed diabetic fish. 
   Section::::Modern fishkeeping.:Live rock.
   When common murres are feeding their young, they return with one fish at a time. The provisioning time relates to the distance of the feeding areas from the colony and the numbers of available fish. There is a strong non-linear relationship between fish density and colony attendance during chick-rearing.
  
  Section::::Relationship to humans.:As a food source.
   Many serrasalmids are in demand as aquarium ornamentals, and several pacus, such as "Piaractus" and "Colossoma", are economically important to commercial fisheries and aquaculture.
   Section::::In the aquarium.
   Vince, talking with Nev, tells the story about how live cod were shipped along with catfish in the same tanks to keep the cod active, and thus ensure the quality of the fish. He further explains this as a metaphor on how there are people in everyone's lives who keep them alert, active, and always thinking. It is implied that he believes Angela to be such a person.
   Fish feeders are usually clamped to the wall of the tank just over the water. They consist of a hopper which is loaded with a variety of dry food, a timer which rotates the hopper at regular intervals (dispensing food in the process), and a method of setting the interval between feeding and the amount of food dispensed. 
  
  Most feeders can dispense flake, pellet, or freeze dried food.
  
  Section::::Benefits of electronic aquarium feeders.
   , these tanks include tropical reef tanks, as well as fish-only tanks. These tanks tend to have a low concentration of microscopic plankton and other foods eaten by filter feeders. Most livestock for these aquariums are acquired through commercial means.
  
  Section::::Modern fishkeeping.:Types of marine aquariums.:Temperate marine (coldwater marine).
   Properly kept and fed a correct diet, Siamese fighting fish generally live between 3 and 5 years in captivity, but may live between 7 and 10 years in rare cases.
  
  Section::::In the aquarium.:Aquarium size and cohabitants.
   The appropriate tank size is directly related to how experienced the fish keeper is, and how often they want to carry out water changes, in order to keep the water pristine. The Betta must of course have enough room to turn around, but there is no evidence that they require a lot of space. Due to their labyrinth organ they are not dependent on high oxygen levels in the water, so a large surface area for gas exchange is not required.
   Goldfish kept in bowls or "mini aquariums" suffer from death, disease, and stunting, due primarily to the low oxygen and very high ammonia/nitrite levels inherent in such an environment. In comparison to other common aquarium fish, goldfish have high oxygen needs and produce a large amount of waste; therefore they require a substantial volume of well-filtered water to thrive. In addition, all goldfish varieties have the potential to reach 5" (12.7 cm) in total length, with single-tailed breeds often exceeding a foot (30.5 cm). Single-tailed varieties include common and comet goldfish.
   An aquarist owns fish or maintains an aquarium, typically constructed of glass or high-strength acrylic. Cuboid aquaria are also known as fish tanks or simply tanks, while bowl-shaped aquaria are also known as fish bowls. Size can range from a small glass bowl, under a gallon in volume, to immense public aquaria of several thousand gallons. Specialized equipment maintains appropriate water quality and other characteristics suitable for the aquarium's residents.
  
  Section::::History and popularization.
  
  Section::::History and popularization.:Antiquity.
   Ideally the bio-mass of fish in the rearing tanks doesn't exceed 0.5 lbs/gallon, in order to reduce stress from crowding, efficiently feed the fish, and promote healthy growth.
  
  Section::::Operation.:Disease and pest management.
   Batfish are gorgeous and striking fish that are not common in aquaria for one major reason: they get huge. A two or three hundred gallon tank is needed for one, minimum, and larger is better. They start out as tiny, manageable-looking cuties, which often fools aquarists into purchasing them for their small aquariums. However they quickly grow to gargantuan proportions, and require large amounts of food as well as space, so beware. They are not reef safe and should be fed plenty of large meaty foods.
   However, there is some question of whether the fish are a good choice for the typical aquarist. While they are not aggressive carnivores like the piranha, their crushing jaw system, used primarily for eating seeds and nuts, can be hazardous. One toddler needed surgery after a pacu (misreported as a piranha) bit her finger at Edinburgh Butterfly and Insect World in Scotland. Commenting on the incident, Deep Sea World zoological manager Matthew Kane warned, "Pacus will eat anything, even children's wiggling fingers."
   Section::::Human use.
  
  "Aulostomus maculatus" is probably a minor part of the aquarium trade. It is often caught in seines and traps by fisheries, to which it is of minor commercial interest.
  
  Section::::Conservation.
   Sharks in captivity
  
  Several species of sharks are kept in captivity in public aquaria. In home aquaria, size constraints mean that only the smallest sharks are typically viable as pets.
  
  Section::::Public aquaria.
  
presuppositions: Fish don't get bored in small tanks. Fish don't get bored in small tanks.
corrections: Fish do get bored in the tank.  Fish do get bored in small tanks.
raw_presuppositions: Fish don't get bored in small tanks. Fish don't get bored in small tanks.
raw_corrections: Fish do get bored in the tank.  Fish do get bored in small tanks.