There are several factors that can modify the transport of eggs and fish larvae, ocean currents and circulation are on the top list. By learning about the currents and circulation, we can estimate where the larvae came from and where they could go to. 
One way to measure the actual water currents is by using an ADCP. What is an ADCP/ well, an ADCP is lovely instrument installed on the haul of the ship that sends acoustic signals into the water column and "profiles" the currents. The ADCp is connected to the storage data system of the ship to record all the information and we are able to watch the currents in real time (live) on a screen.
As an oceanographer, my sweet dream is to collect good data of currents. but one day, checking on the ADCP screen something happened, the currents seemed to go so wrong!, What todo ?, well checking everything (even going into small and dark confined places), super Ryan Smith from AOML gave us a piece of advice and in a calm voice from the phone he said to John, "no worries" the data is coming ok, it is just a display problem. After that, I felt some peace of mind, the terrible nightmare vanished becasue we have GOOD DATA OF THE OCEAN CURRENTS, it just means we have to do additional processing of the data, but good data nonetheless. So, I am looking into the ADCP screen and praying for collecting current data that could help to explain why the larvae are there and where they could go.
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