mysqli_fetch_assoc?

Warning: mysqli_fetch_assoc() expects exactly 1 parameter, 0 given in /www/htdocs/w010875e/php/login.php on line 35

while ($dsatz = mysqli_fetch_assoc())

$con = new mysqli("127.0.0.1","","");
	mysqli_select_db($con,"f");
	$ress = $con ->query("SELECT * FROM accounts");