from datetime import date

class fish:

    def __init__(self,name, species):
        self.name = ""
        self.species = ""
        self.date_added = date.today()
        self.swimming = True        

class shark:

    def __init__(self,name, species):
        self.name = ""
        self.species = ""
        self.date_added = date.today()
        self.swimming = True        

class eel:

    def __init__(self,name, species):
        self.name = ""
        self.species = ""
        self.date_added = date.today()
        self.swimming = True        

class whale:

    def __init__(self,name, species):
        self.name = ""
        self.species = ""
        self.date_added = date.today()
        self.swimming = True        

class dolphin:

    def __init__(self,name, species):
        self.name = ""
        self.species = ""
        self.date_added = date.today()
        self.swimming = True        