ДЗ Аквариум

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;

namespace Aqua
{
    class Program
    {
        static void Main(string[] args)
        {
            Aquarium aquarium = new Aquarium();
            bool runProgram = true;

            while (runProgram)
            {
                Thread.Sleep(1000);
                Console.Write('S');
                if (Console.KeyAvailable)
                {
                    ConsoleKeyInfo key = Console.ReadKey(true);
                    switch (key.Key)
                    {
                        case ConsoleKey.D0:
                            break;
                        case ConsoleKey.I:
                            Console.WriteLine("Введите вид рыбы, которую хотите добавить ");
                            int speciesIndex = Convert.ToInt32(Console.ReadLine());
                            aquarium.AddFish(Fisher.OrderFish(speciesIndex));
                            break;
                        case ConsoleKey.R:
                            Console.WriteLine("Введите номер рыбы, которую необходимо убрать ");
                            int fishIndex = Convert.ToInt32(Console.ReadLine());
                            aquarium.RemoveFish(fishIndex);
                            break;
                        case ConsoleKey.E:
                            runProgram = false;
                            break;
                    }
                }
            }

        }

        static class Fisher
        {
            private static string[] _speciesName = new string[] {
                "Окунь", "Сом", "Анчоус"
                };
            private static int[] _speciesAge = new int[] { 10, 20, 12 };

            public static Fish OrderFish(int speciesIndex)
            {
                int age;
                int maxAge;
                Random rand = new Random();

                maxAge = _speciesAge[speciesIndex];
                age = rand.Next(maxAge);
                return new Fish(_speciesName[speciesIndex], age, maxAge);
            }

        }

        class Fish
        {
            private int _age;
            private int _maxAge;
            private string _speciesName;
            public Fish(string speciesName, int age, int maxAge)
            {
                _speciesName = speciesName;
                _age = age;
                _maxAge = maxAge;
            }
        }

        class Aquarium
        {
            private Fish[] _fishes;

            public Aquarium()
            {
                _fishes = new Fish[] { };
            }

            public void AddFish(Fish fish)
            {

            }

            public void RemoveFish(int fishIndex)
            {

            }

            public void ShowInfo()
            {

            }
        }
    }
}