One of my favorite platforms for retrieving geodata is the Fao GeoNetwork. It may take a while to load the page but the data collection is quite extensive and definitely worth the wait. On the site you can conduct searches of data that you may need. Usually you can download the data straight from the page, which is very convenient. I like the fact, that metadata and screenshot are also provided. This really helps to get an idea of what the data is about, so you are not disappointed after a long download and unzipping process.
For fish related data, type in "fish" Into the "What?" search space on the left hand side and you will receive all data related to fish. You can also search for fish data relative to the countries, by using the map or by choosing the country from the drop down menu.
The data comes in some of your favorite GIS formats, such as shapefile, grid and geotiff. If you use this data, please make sure to reference the right organization. Reference information can usually be found in the metadata.
I will describe some of the data found on this page in more detail, in later posts.
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