Yes when they are 6 inches but not when 2 inches. Seine surveys are a major method to tell if you had a spawn. See this.
http://msucares.com/pubs/publications/p1428.pdf page 16
Determining Fish Balance
Seining – the use of a net to capture fish – is a quick
and easy way to determine the condition of your
pond, and an investment in a good seine is highly
recommended for all pond owners. A 30-foot seine
that is 6-feet deep and made of ¼-inch mesh works
well. You can purchase it from any net maker. Attach
the seine ends to wooden or metal poles to
make handling the seine much easier.
Check balance using a seine every year in late-
May to July. During this period, both bass and
bream have reproduced and the young are still small
enough to be caught effectively using the seine.
Fishing the seine is easy. You can use a “swinging
gate” or perpendicular haul (Figure 7) in several
areas of the pond to capture young fish. Just make
sure you keep the weighted line of the seine on the
bottom at all times, or the fish will escape under the net.
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