What is the fine-grained topic of the following text: Fishing trials with various types of squid jigs were attempted in the Southern Ocean from 40o to 43o S and 53o to 58o3’ E during the 6th Indian Southern Ocean Expedition from 23 December 2011 to 6 February 2012. Only return the topic.
Fishing trials of squid jigs in the Southern Ocean during the 6th Indian Southern Ocean Expedition.