Difference between 捞 and 拿？
Is 捞 only used for grabbing something out of liquids？ 


It could also be used metaphorically. You can 捞好处, 捞钱, 捞名声, 捞官职, etc. In this usage, 捞 implies selfishness.


  If you are grabbing something out of the water is there a difference between 捞 and 拿？ 


It's common to see a foreign language having specific words for something that's not so specific in your native tongue. In English you "wage war", but in Latin and other languages you simply "do war". Like "wage" for wars, 捞 is more colloquial when it comes to grabbing from water. 


  （Does 捞 imply a bowl like structure like “Ladel”？）


Any tool could be possible, a bowl, a fishing net, or even bare hands, as long as it does the job. 捞 doesn't imply anything specific.