This volume contains six chapters that detail recent advances in marine biology. Chapter One highlights the usefulness of zebrafish for biological screening of hydrogels based on amino acid and acrylates and hydrogel scaffolds based on alginate, gelatin and 2-hydroxyethyl methacrylate. Chapter Two aims to critically review the effects of climate change on green mussels and the environmental factors that may influence mussel production. Chapter Three explores how certain oceanographical phenomenas or events affect local marine ecosystems and the cetacean communities in Indonesia. Chapter Four assesses the bycatch and discardment in benthic trawling in Northern Tunisia. Chapter Five covers the parasitic diseases that are common in rainbow trout, the ways to prevent and control these diseases, the treatment methods of the diseases, and the life cycles of the parasites. Lastly, Chapter Six reveals a comprehensive study of the nutritional content, fatty acid profile and shelf life of rainbow trout.