English Specification for Catfish class:-
Attributes and behaviors similar to those for AlgaeColony
=========================================================
Constant class attributes:
	ALIVE: Private attribute. 
		Represents status of Catfish that is alive as a String. 
	DEAD: Private attribute. 
		Represents status of Catfish that is dead as a String. 
	SPECIES: Private attribute. 
		Represents species of lifeform as a String. 
	BABY_MAX_ENERGY: Private attribute. 
		Represents maximum energy that can be carried as an integer. 
	BABY_MIN_ENERGY: Private attribute. 
		Represents minimum energy needed to stay alive as an integer. 
        RIGHT: Private attribute.
		Represents the direction of Catfish facing right as a String. 
	LEFT: Private attribute.
		Represents the direction of Catfish facing left as a String.
	UP: Private attribute. 
		Represents the direction of Catfish facing up as a String.
	DOWN: Private attribute.
		Represents the direction of Catfish facing down as a String. 
	ENERGY_TO_SWIM:Private attribute
		The amount of energy a catfish must expend to swim.
	ENERGY_TO_EAT:Private attribute
		The amount of energy a catfish must expend to eat.
	ENERGY_TO_LOOK_FOR_FOOD:Private attribute
		The amount of energy a catfish must expend to look for food in the form of AlgaeColony.
	ENERGY_IN_A_FULL_MEAL:Private attribute
		The amount of energy a catfish can gain from a full meal of AlgaeColony.
	MIN_ENERGY_GROWTH_INCREMENT:Private attribute
		The amount by which the minimum energy required by each catfish to stay alive increases in a time block.As each catfish gets older by a time block, the minimum energy it needs to survive should increase. 
	MAX_ENERGY_GROWTH_INCREMENT:Private attribute
		The amount by which the maximum energy stored by each catfish increases in a time block. 
		As each catfish gets older by a time block, the maximum energy it can store should increase. 
Constant instance attributes:
	name: Private attribute. 
		Represents unique name as a String 
Instance attributes: 
	row: Private attribute. 
		Represents row identifying the location as an integer. 
	column: Private attribute. 
		Represents column identifying the location as an integer. 
	deadOrAlive: Private attribute. 
		Represents living status as a String. 
	energy: Private attribute. 
		Represents current energy level as a String. 
	age: Private attribute. 
		Represents age as an integer. 
	simulation: Private attribute. 
		Represents simulation to which the Catfish belongs as an object of Simulation class.
	minEnergy: Private attribute.
		Represents minimum energy needed to survive as an integer.
	maxEnergy: Private attribute.
		Represents maximum energy that can be carried as an integer.
Instance attribute:
	direction: This private attribute represents the direction in which the Catfish is facing as a String.
Class attributes: 
	nCatfishCreated: Private attribute.
		Represents number of Catfish created so far as an integer, to help the Simulation object keep track of the total number of Catfish in the simulation.
Behaviors: 
	Constructor: Create an instance of the Catfish class. 
        getRow: Return the row in which Catfish is located as an integer. 
			Part of the public interface.
        getColumn: Return the column in which Catfish is located as an integer. 
			Part of the public interface.
        getAge: Return the age of Catfish as an integer. 
			Part of the public interface.
        getColor: Return the color of the Catfish as a String. 
			Part of the public interface.
        getName: Return the unique name identifying the Catfish as a String. 
			Part of the public interface.
        getMinEnergy: Return the minimum energy needed to stay alive as an integer. 
			Part of the private interface.
        getMaxEnergy: Return the maximum energy that can be carried as an integer. 
			Part of the private interface.
        getEnergy: Return the current energy level as an integer. 
			Part of the public interface.
        setEnergy: Set the energy level as specified by the integer value passed as a parameter. 
			Part of the private interface.
        die: Update living status to being dead. 
			Returns nothing. 
			Part of the private interface.
        isDead: Return the living status of the Catfish as a boolean. 
			Part of the public interface.
        getDirection: Check the direction in which the Catfish is facing. 
		Returns a String. 
		Part of the private interface.
        isHungry: Check if the current energy level of the Catfish is less than twice the amount needed for survival. 
		Returns a boolean. 
		Part of the private interface.
        moveToRow: Move the Catfish to the row specified by the integer value passed as a parameter. 
		Returns the row where the Catfish is moved as an integer. 
		Part of the private interface.
        moveToColumn: Move the Catfish to the column specified by the integer value passed as a parameter. 
		Returns the column where the Catfish is moved as an integer. 
		Part of the private interface.
        getSpecies: Return the species of the Catfish as a String. 
			Part of the public interface.
        getDisplayMechanism: Return the mechanism used for displaying the Catfish as a String. 
			Part of the public interface.
        getImage: Return an image representing the Catfish. 
			Part of the public interface.
        lookForFoodInNeighborhood: Try to locate any AlgaeColony close by. Relinquish some energy in the process. 
				Note that this behavior requires a way to store the neighboring AlgaeColony objects. 
	liveALittle: Live a block of time. 
			Part of the public interface.
	eatIfPossible:Check if the current energy level of the Catfish is less than the amount needed for survival and decide wether to eat.part of private interface
	swimIfPossible:Check if the current energy level of the Catfish is less than the amount needed for survival and decide 
			wether to swim.
			part of the private interface.