Shrimp

Stoll et al divisions

Networks

All harvesters

• Pre-closure: 2009-2013
• Post-closure: 2016-2020

	Density	Modularity
pre-closure	0.6861538	0.09770782
post-closure	0.6984615	0.1134786

Shrimpers

	Density	Modularity
pre-closure	0.5753846	0.02094438
post-closure	0.6492308	0.0368168

Non-shrimpers

	Density	Modularity
pre-closure	0.5846154	0.09902984
post-closure	0.6584615	0.1255848

Changes in portfolios of shrimp harvesters

Entry and exit

The proportion of licenses held by shrimpers didn’t appear to change dramatically by those who chose to continue in fisheries. Lobster was still the dominant target species by these harvesters.

Difference in difference estimator

Did the closure of the shrimp fishery impact the number of licenses held by harvesters?

According to the DiD estimator, the closure did negatively impact those shrimpers in a statistically significant way. It may be worth noting that a significant number of harvester left fisheries entirely after the moratorium and we may need to figure out a way to incorporate exit and entry in the difference-in-difference estimation.

Chord diagrams

Updated as of Oct 31 See Manuscript development