Fishing Island acts as a large Fishing Aggregate Device (FAD),
below is an article that describes how a FAD works.



This Is Taken From a Report by the State of Hawaii's Department Of Land and Natural Resources on Fishing Aggregate Buoys in Hawaii.  If you would like to read the entire report from January 1983, we've provided it in it's entirety here.

   Fish aggregating buoys are man-made floating objects (flotsam) placed (anchored or free floating) in the ocean to attract and concentrate certain pelagic fishes. Fish buoys have been used in the Philippines, Japan Sea, Mediterranean Sea, and in other areas of the world. Filipino fishers use large bamboo rafts called "payaos" in their tuna purse seine fishery. As much as 200 metric tons of tuna have been reportedly caught in a single purse seine set around payaos. Japanese fishers use bamboo fish buoys called "tsuke"; elsewhere, fishers use materials such as palm and coconut fronds, cork slabs to fabricate their buoys.

  Why do fish buoys aggregate fish? Scientists have offered a number of' hypotheses on this subject. Larger fishes may be attracted to food such as smaller forage fish and plankton gathered around the buoy. Shelter, reproductive spawning substrate, a "station" where fishes can have parasites removed by "cleaner fishes" are' all plausible explanations for the enormous fish attracting power of the buoy. It may simply be serving as a point of reference in the open ocean environment.

Read The Entire Report

Other Resources on FADs.

Wikipedia : Fishing Aggregate Devices

Wiomosa.org Article on Fishing Aggregate Devices

University Of Hawaii FAD Program

University Of Hawaii map of FADs in the Hawaiian Islands