Backyard Aquaponics
A place to discuss aquaponics

Plants are doing amazing. Peas growing all over the rafters, squash growing over the media bed, down to the floor, tomatoes tied up to the rafter and flowers everywhere however, fruit production has been extremely poor. 3 tomatoes, one huge cucumber, several smaller squash not growing very much, the chiltepin peppers have lots growing but thats about it. I added a 50% shade cloth, exhaust and input fan at opposite ends of the greenhouse. Water is staying in the low 80's. Fish seem to be more or less active depending on the PH. About 12 died in April and May, lost only one since and they are growing. I shake the tomato plants for pollination but shaking all the plants doesnt seem to be doing anything so I am thrilled with the plants but disappointed in the production. Adding about 10 gallons of water a day due to evaporation, filling two 5 gallon pails in the morning and then putting that water in the tank the next morning.

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Umm.. I have a plastic roof over the top of my system and an open end and gap above fence and there is NO BEES..

Is that an enclosed grow house..?? How would pollination. Insects get in

I thought I read.a claim that most pollinators use flower colour and UV light to "see" them..

I wonder if such insects would see the right colours. Thru and under such materials.. and then we have the bee colony collapses thanks to Bayer et al and their claimed killing sprays..

EVERY SINGLE TOMATO in our system, has been hand polinated... buggar!
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Probably has something to do with the temperature it's not just daytime highs sometimes they won't set if the temps above a certain amount at night. There are other causes as well, mostly environmental like the air is too dry or too humid, temps to high or low, air pollution can cause bud drop and there are probably some others. Considering where you are I'm going to guess temperature because your nightly lows are probably above 75 F.

Scotty is right with the Temps,with your water in the low 80s your DO levels are beginning to get on the low side,this will hinder root growth and nutrient uptake,when air temps start reaching 95 your plants will generally slow down,fruit set being one of the obvious symptoms.
Try pruning them to thin them out and get airflow around the plant and worth trying give them a foliar spray of MPK,spray them last thing in the evening as its beginning to cool down.