Interestingly the TMX Select secondary plaform is slated to be closed in a few weeks.

The exchange operator announced on Friday that it's planning to decommission TMX Select after the close of trading on Fri., Sept. 18. The move comes as part of a plan unveiled last year to address some of the market structure issues that have arisen in recent years, including increased market complexity; the impact of the technological arms race in trading; and the threat of Canadian order flow migrating to the U.S.

http://www.investmentexecutive.com/-/tmx-select-to-close-on-sept-18

In the same article it makes reference to dark orders or what are sometimes called "dark pools"....

Closing TMX Select and the Alpha IntraSpread marketplace catering to dark orders....

Here's what Investopedia has to say about "dark pools"....

The dark pool gets its name because details of these trades are concealed from the public, clouding the transactions like murky water. Some traders that use a strategy based on liquidity feel that dark pool liquidity should be publicized, in order to make trading more "fair" for all parties involved.

Read more: Dark Pool Liquidity Definition | Investopedia http://www.investopedia.com/terms/d/dark_pool_liquidity.asp#ixzz3jrWmtbr1
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According to a Chinese proverb murky or muddy waters are where the fishing is best.....hopefully that axiom will hold true here.