I really can't speak for your location, but I put down "contractors mix" grass seed. It is mostly fescue and some rye. The rye comes up faster than the fescue and gives you some cover right away, but the fescue is much more heat tolerant and typically takes over. My dam is mostly clay, but did have some pond muck mixed in due to it being a renovation rather than a new build.

You will be much better off getting some topsoil on it in the long run, but that will be much more work and timing will be important. IMO, I would wait until after the rainy season to put it down and seed, but then you have to make sure it gets watered. I would hate to see money thrown at soil to have it wash into the pond.

Consider raking in some mixed seed now and see how it does with the idea of making it better after spring.

To be honest with you, when I have seeded bare soils on my place with the mixed bag of seed...within a year most of the original grass has been overrun with what likes my clay and rocky soil (crabgrass, fescue, and weeds. My efforts seem to contribute to an immediate coverage, but there's no way to establish pretty lawn...without a regular maintenance plan involving fertilizer and aeration, I will never have a yard worth bragging about.


Fish on!,
Noel