Colura and Bumguardner: Effect of the salt-box catch-bycatch separation procedure, as used by the Texas shrimp industry 
403 
Table 4 
Species collected from bycatch of Texas bay shrimpers and in Texas Parks and Wildlife (TPW) samples. X indicates that the species 
was collected. 
Common name 
Species 
Bay shrimpers 
TPW 
Vertebrates 
Atlantic bumper 
Chloroscombrus chrysurus 
X 
Atlantic croaker 
Micropogonias undulatus 
X 
X 
Atlantic cutlassfish 
Trichiurus lepturus 
X 
X 
Atlantic midshipman 
Porichthys plectrodon 
X 
X 
Atlantic spadefish 
Chaetodipterus faber 
X 
X 
Atlantic stingray 
Dasyatis sabina 
X 
Atlantic threadfih 
Polydactyl us octonemus 
X 
bay anchovy 
Anchoa mitchilli 
X 
X 
bay whiff 
Citharichthys spilopterus 
X 
X 
bighead searobin 
Prionotus tribulus 
X 
X 
blackcheek tonguefish 
Symphurus plagiusa 
X 
X 
bluefish 
Pomatomus saltatrix 
X 
bluntnose jack 
Hemicaran x am blyrhyn ch us 
X 
X 
gafftopsail catfish 
Bagre marinus 
X 
X 
gulf butte rfish 
Peprilus burti 
X 
gulf menhaden 
Brevoortia patronus 
X 
X 
hardhead catfish 
Alius fells 
X 
X 
harvestfish 
Perprilus alepidotus 
X 
X 
hogchoker 
Trinectes maculatus 
X 
X 
inshore lizardfish 
Synodus foetens 
X 
X 
least puffer 
Sphoeroides parvus 
X 
X 
lookdown 
Selene vomer 
X 
pinfish 
Lagodon rhomboides 
X 
X 
sand seatrout 
Cynoscion arenarius 
X 
X 
silver jenny 
Eucinostomus gula 
X 
silver perch 
Bairdiella chrysoura 
X 
X 
skipjack herring 
Alosa chrysochloris 
X 
southern flounder 
Paralichthys lethostigma 
X 
X 
southern kingfish 
Menticirrhus americanus 
X 
spot 
Leiostomus xanthurus 
X 
X 
spotted seatrout 
Cynoscion nebulosus 
X 
star drum 
Stellifer lanceolatus 
X 
threadfin shad 
Dorosoma petenense 
X 
Invertebrates 
Atlantic brief squid 
Lolliguncula brevis 
X 
X 
blue crab 
Callinectes sapidus 
X 
X 
brown shrimp 
Penaeus aztecus 
X 
X 
white shrimp 
Penaeus setiferus 
X 
survival rates were 76.1% (±21.7%) and 55.5% (±35.1%), 
respectively for SB and NSB samples. Final survival rates 
were 12.9% (±6.0%) for SB samples and 34.5% (±28.9%) 
for NSB samples. Means of initial and final survival were 
not significantly different. Average (±SD) M of organisms 
separated by use of a salt-box (0.08 [±0.03]) were signifi- 
cantly lower than M of bycatch separated without the aid 
of a salt-box (0.48 [±1.23]). 
For individual species, comparison of the effect of use 
and non-use of a salt-box on M , and on initial and final 
survival variables could only be determined for Atlantic 
croaker. Other species were either found infrequently in 
individual samples, or in insufficient numbers within the 
sample type. Estimates of initial and final survival for At- 
lantic croaker were obtained from 19 samples (6 NSB sam- 
ples and 13 SB samples). Estimates of M were obtained 
from 16 samples (4 NSB samples and 12 SB samples). 
Samples not used bad too few Atlantic croaker (i.e. only 
one or two specimens in the sample or no deaths) to make 
estimates of percent survival or M. Means of the three es- 
timates used to compare the two separation techniques 
were highly variable for Atlantic croaker (Table 6). Means 
