Artificial reef for juvenile and adult fish of sedentary species e.g. shellfish, has ecological box filled with soft sand or gravel, where box includes tapered ceiling at specific acute angle for generating narrow space of shelter

摘要

The reef has an ecological box (1) consisting of flat or curved walls made of flexible, semi-rigid or rigid solid plastic sheets or concrete slabs, where the box is perforated and filled with soft sand or gravel. The box includes a tapered ceiling (6) positioned at acute angle of about 3 to 25 degrees for generating a narrow space (4) of a shelter. The box includes a broader space (3) located near an entry (2) that is partially sealed by walls (8, 8'), where the broader space is covered by a flat ceiling.