Red spotted grouper Epinephelus akaara is a target species for artificial production and stock because of high market value and their poor migrate habit. But it is feared to decrease for predation and/or starvation immediately after stock. To increase survival rate of grouper seeds, we proposed to stock them into the artificial reefs with shells to provide prey organisms. These reefs were attached the protection units with scallop shells, having achievements as refuge. Results as post-research 8 days after stock, it's suggested that reefs with units have seeds stay as 2.8 times high as without units (24.1% to 8.6% both on the average). Reefs with more complicated units, moreover, could hold 1.3 times more seeds than uniformed ones (29.2% to 23.3% both on the average) and accommodate more various length seeds than smaller ones (F-test, P<0.05). Their gut contents coincided with small animals increasing in reefs. Judging from those results, the institutions are effective for seeds to forage and inhabit as the nursery. We are convinced that this technique makes harbor area strengthen the aquaculture function to insert into the harbor facilities.

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The density of Eurasian Tree Sparrow Passer montanus nests in relation to proximity to urban parks and the presence of air vents in houses.