Munyandorero: Climate effects on Micropogonias undulatus 
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Appendix 1 
Characteristics of the Bottom Trawl Surveys of the North- 
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Surveys 2 . Data obtained from these surveys were used 
to develop biomass indices for the population of Atlantic 
Croaker (Micropogonias undulatus) off the U.S. Alantic 
coast during the period of 1972-2008. 
Attributes 
NEFSC 
SEAMAP 
Start year 
1963 
1986 
Area coverage 
Cape Hatteras (North Carolina, NC)-Cape Cod 
(Massachusetts) 
Cape Hatteras (NC)-Cape Canaveral (Florida) 
Targets 
Finfish and invertebrates 
Finfish, elasmobranchs, sea turtles, invertebrates, 
and algae 
Objectives 
Monitor trends in abundance, distribution, and life 
history traits 
Monitor trends in abundance and reproductive 
conditions 
Covariates 
Latitude, longitude, salinity, temperature, weather, 
and hydrographic parameters 
Salinity, water and air temperatures, weather, 
and hydrographic parameters 
Design 
Stratified random (strata: depth ranges; inshore vs. 
offshore) 
Stratified random (strata: depth contours; depth 
ranges 2 ) 
Sampling gear 
#36 Yankee otter trawl (5-fathom legs; 1,000-lb poly- 
valent door; 0.5-inch codend liner) 
Trawl body: #15 twine and 47.6-mm stretched 
mesh codend: #30 twine and 41.3-mm stretched 
mesh codend 
Tow duration 
30 minutes 
20 minutes (daylight hours) 
Sampling intensity 
Fall (inshore) surveys since 1963; spring surveys since 
1968; intermittent summer and winter surveys 
Surveys in spring (April-May), summer (July), 
and fall (October) 
Evaluation 
Fall surveys regularly encountered Atlantic Croaker 
since 1972; targeted multiple age classes (0-13 year- 
old fish) 
Most zero tows in spring surveys; only fall sur- 
veys were consistent since 1990; targeted multi- 
ple age classes (0-6 year-old fish) 
1 Formerly known as Shallow Water Trawl Surveys; conducted by the South Carolina Department of Natural Resources, Marine 
Resources Division. 
2 Deeper strata (10-19 m) sampled during 1989-2000; abandoned in 2001 to concentrate on shallower depth zones. 
