Certainly! Here is detailed information about guppy fish for hobbyists covering caring, breeding, aquarium size, and standards:

Caring for Guppy Fish:
1. Aquarium Size: Guppies are small tropical fish, so a minimum tank size of 10 gallons (37 liters) is recommended for a small group.
2. Water Parameters: Guppies prefer water temperature between 72-82°F (22-28°C), pH level around 7.0-7.5, and water hardness between 8-12 dGH.
3. Filtration and Aeration: Use a filter to maintain water quality and ensure proper aeration for your guppies.
4. Lighting: Provide a light source for 10-12 hours a day, as guppies appreciate a regular day-night cycle.
5. Tank Setup: Include plants, such as Java moss or Hornwort, to provide cover and breeding spots. Add hiding places, like caves or PVC pipes.
6. Feeding: Offer a varied diet of high-quality flake or pellet food, supplemented with occasional live or frozen foods like brine shrimp or daphnia.
7. Water Changes: Perform regular partial water changes (around 25%) weekly to maintain water quality.

Breeding Guppy Fish:
1. Separate Breeding Tank: Set up a separate breeding tank, as adult guppies might eat their fry.
2. Ideal Water Conditions: Maintain optimal water parameters as mentioned above, with a temperature closer to the higher end of the range.
3. Introducing Males and Females: Place one or multiple females with one male in the breeding tank.
4. Providing Hiding Spots: Add floating plants or breeding traps to protect the fry from adult guppies.
5. Gestation and Birth: After mating, female guppies can store sperm to fertilize multiple batches of fry. Gestation lasts around 4-6 weeks.
6. Fry Care: Once fry are born, provide them with proper nutrition, including crushed flake food or baby brine shrimp.
7. Separating Fry: Separate fry from adult guppies after birth to prevent predation.
8. Growth and Development: Fry grow quickly and become sexually mature at around 3-4 months of age.

Guppy Fish Standards:
1. Body Shape: Guppies should have a streamlined body with a slightly rounded belly.
2. Fin Shape: The tail should be well-developed, symmetrical, and have a good spread. Other fins should be well-formed, without any deformities or tears.
3. Coloration: Guppies come in various color variations, including solid colors, metallics, and patterns like snakeskin or tuxedo.
4. Finnage: Well-developed fins, without excessive branching or deformities, are desirable.
5. Size: Males typically grow to around 1.5-2.5 inches (4-6 cm), while females are slightly larger.
6. Health: Choose guppies that appear healthy, active, and free from any signs of disease or parasites.
7. Breeding Traits: Select guppies with desired traits, such as vibrant colors, tail shape, or patterns, for breeding purposes.

Remember, maintaining proper water conditions, providing appropriate nutrition, and keeping a close eye on the health of your guppies are essential for their well-being. It's always recommended to research further or consult with experienced breeders or hobbyists for specific guidelines pertaining to your guppy fish breeding and care.