Nice work for your first "real" programming project! Now that you have all the basics working, you'd be amazed at how much more it feels like a game when you add stuff like a title screen, maybe a timer that runs out before you catch all the fish. Adding different types of fish and levels would make this really fun too!

I get an error, tryig to execute your jar-file (OSX):

Exception in thread "main" java.lang.UnsupportedClassVersionError: com/staticvoidgames/svgexe/SvgExeLauncher : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637)
at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

You can improve this game so much when you get better on programming, so, keep going ;)

Pythong, that means you have an old version of have installed. Try updating your java, which you should do anyway!

Simple graphics, but a very good start! I included this game in part 7 of my Ludum Dare Compilation video series if you'd like to check it out :) http://youtu.be/Lm7qNa6SIqA

There is room for so much more to do. Everybody starts with something little and then expands to bigger things. There is no much to say about the gameplay im afraid.