In New York Golden shiners spawn over an extended period from May to July. Females deposit adhesive eggs over filamentous algae and submerged weed beds. After spawning, the eggs are abandoned. Adults are usually less than 6 inches long.
Reproduction begins in the spring when the water temperature reaches 68ºF and continues for several months until the water temperature exceeds 81ºF. A pound of golden shiners may produce over one-half million eggs in a season. Golden shiners are broadcast spawners; they lay adhesive eggs on submersed vegetation, or in culture ponds, on mats of latex-coated coconut fiber. The small eggs (~1-mm diameter) hatch in three to five days, depending on water temperature.
Spawning mats are added to the pond during the spawning season when water temperatures reach 70F (21.1C), typically April to June in north Florida. The number of mats placed in the pond varies with spawning activity, and it is important to use the minimum number necessary to ensure high use of each mat and to prevent unused mats from getting fouled with dirt and algae. Mats are placed level along the shore at 1–2 (2.5–5 cm) water depth.
If the pond has real shallow weeds or filamentous algae this structure should provide substrate for GSH to lay their eggs. artificial materials see below.
Mats. http://www.beemerfisheries.com http://www.beemerfisheries.com/mats.html
Spawntex spawning mat. https://pentairaes.com/spawntex-spawning-mat.html
This is used for Kio and carp spawning and could work for GSH. you can use tightly packed Spanish Moss or frayed nylon rope to create the mat. Some breeders even use evergreen branches. Generally speaking, anything that is nontoxic and about 4 inches deep will work.
Alternate option for collecting eggs. The egg mats consist of 3.5-foot by 2.5-foot metal frames that weigh about 20 pounds and are filled with a material similar to that used for a furnace filter. Mats are deployed by being gradually lowered to the river bottom from the bow of a boat. Furnace filters would work as smaller mats.
Another method of collecting eggs. As water temperatures reach 68 °F, place synthetic substrates or mats (Spawntex®) around the shallow edge of the pond for the females to lay their eggs on. Mats are about 2 inches thick and made of coconut fibers with a latex binder. This material is generally purchased by the roll and will need to be cut into smaller sections, about 3 feet by 2 feet is recommended. Attach the cut sections to a wire frame, and then suspend the sections below the water surface. This can be done using floats as in the picture shown but other methods will work as well (Figure 6.1). The mat material is too dense to allow fish to pass through, but each mat has sufficient void spaces to allow eggs to be trapped and retained. The mats should be left in the pond 3-7 days depending on the rate of egg deposition and temperature.