If you have actually read the literature, you would know that sorption of organic material by the epilithic organic layer on substrate is important. Seagull [Bleeeeep!] meets the delivery requirement. So does decay of tribal carcass overfishing overload. So yes, seagull [Bleeeeep!] can be beneficial. And direct consumption is also important. Break down of carcasses or any other organic material can enhance productivity.