Intergration of my existing site and wordpress

I would like to know if there is a way for me to intergrate wordpress with my existing website. My link is https://www.gonefishingboard.com which is a premade template. I wanted to know if I could use WordPress to manage the blog but have the posts show up on my site without interupting the homepage or making it look any different.

Any insight would be great.

Thanks Ryan