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What freshwater aquarium fish breeds the fastest? The guppy, or other livebearers reproduce the quickest. Guppies can start reproducing when they are 2 – 3 months old and tend to give birth every 30 days. A batch of fry can range from 20 to 50 babies.
Livebearers are aquarium fish that retain the eggs inside the body and give birth to live, free-swimming young. Among aquarium fish, livebearers are nearly all members of the family Poeciliidae and include: guppies, mollies, platies and swordtails.
Livebearing fish are some of the most popular tropical aquarium fish of all time and include guppies, platies, mollies and swordtails. They are so-called because the females give birth to live young, instead of laying eggs like other freshwater fish species.
Guppies are pregnant for 21-31 days on average, though the birth usually falls in between 22-28 days. The delivery may take longer if the water is cold or if other fish in the tank are causing her stress. Guppies can get pregnant about once a month under optimal conditions.
A female guppy can have 50-60 young at one time.
Seahorses and their close relatives, sea dragons, are the only species in which the male gets pregnant and gives birth. Male seahorses and sea dragons get pregnant and bear young—a unique adaptation in the animal kingdom. Seahorses are members of the pipefish family.
Many aquarium fish like guppies give birth to between 10-40 fry at once. Some shark species typically give birth to only one young fish at a time. Other fish, like seahorses, give birth to 2,000 offspring at a time – and it's the males who give birth.
In about 4 to 6 weeks, the babies should be large enough to release into the main aquarium. But be sure the babies have grown larger than the mouths of adult fish. If it's not possible to set up a separate aquarium, drop-in breeders are a great alternative.
Ideally, pregnant females should be placed on their own in a separate aquarium with lots of feathery plants where they can give birth in a stress-free environment. Then again, once she releases the fry she is returned to the main tank and the fry can be grown on separately.
Fish. Live birth is also rare in fish, accounting for about two percent of known species, including guppies and sharks.
Bacteria such as certain Bacillus stearothermophilus strains can double in size, as a percentage of bodyweight, every 10 minutes under optimal conditions. So, given unlimited resources, in one day a single bacterium could produce more offspring than the combined weight of all the organisms in the world!
Most sources believe that the fastest species of fish is the Indo-Pacific Sailfish, Istiophorus platypterus. According to Johnson and Gill (see below) the species has been clocked in excess of 110 km/h (68 mph) over short periods. The Indo-Pacific Sailfish grows to over 3.4 m in total length and 100 kg in weight.
A Lotta Mola
The mola, or ocean sunfish, looks like an animal cracker someone bit in half. At 5,000 pounds, though, this temperate and tropical water animal is the world's heaviest bony fish. It's also the heavyweight egg producer, releasing 300 million eggs over a spawning season.
Ethical considerations preclude definitive research on the subject, but it's safe to say that human DNA has become so different from that of other animals that interbreeding would likely be impossible.
New discoveries amaze us each day. And this exactly what has happened yet again. Two female ray fish have given birth to pups without a male ray fish being present in their ranks. The news has created quite a stir in scientific community and beyond.
Fish reproduce by bearing live young or by laying eggs. Livebearers give birth to fully formed and functional young called fry. The eggs are fertilized and hatch within the female.
If you smell sour, rancid, or fishy odors in raw or cooked seafood, do not eat it. If you smell either a fleeting or persistent ammonia odor in cooked seafood, do not eat it.
Within about 20 to 40 days after the mating ritual has concluded, the female will develop a bulge in the abdomen; a red or black spot may form toward the rear of the abdomen signifying her pregnancy. Guppies and mollies can deliver as many as 20 fry at once.
You can determine the sex of your fish by inspecting its gonads (reproductive organs), which are located towards the top of the gut cavity. Mature female fish will have orange ovaries and male fish will have white testes (see photos above).
Guppy. Guppies are highly prolific livebearers giving birth to between five and 30 fry, though under extreme circumstances, she may give birth to only one or two or over 100. The gestation period of a guppy is typically 21–30 days, but can vary considerably.