Animal Planet Whale Wars

[quote=Fred Fry;24678]OK, it was asked a while back, but I finally ran across the IMO Number for the BOB BARKER

IMO No. 5280540
Call sign: 5VBR5
Flag: Togo
Registered Owner: Sea Shepherd Conservation<O></O><TABLE class=MsoNormalTable cellPadding=0 border=0><TBODY><TR><TD style=“PADDING-RIGHT: 0.75pt; PADDING-LEFT: 0.75pt; PADDING-BOTTOM: 0.75pt; PADDING-TOP: 0.75pt”>

</TD><TD style=“PADDING-RIGHT: 0.75pt; PADDING-LEFT: 0.75pt; PADDING-BOTTOM: 0.75pt; PADDING-TOP: 0.75pt”>

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I have looked up the IMO # at Miramar Ship Index. It lists an initial tonnage of 597 then an increase to 598 followed by 788, and now I read news reports saying 1200 tons.

Is it possible for a ship to be modified and have it’s tonnage change this much?