Table 3. — Weekly fishing effort for bait shrimpers in lower Tampa Bay, 

 October 4, 1961, through April 8, 1962 



Week of sample 



Shrimp 

 caxjght 



Boats 

 per day-"- 



Boat- 

 hours 



Afen- 

 hours 



Shrimp per 

 man-hour 



Shrimp per 

 boat-hour 



1961 



Oct, -i-S 



Oct. 9-15 



Oct. 16-22 



Oct. 23-29 



Oct. 30-Nov. 5 



Nov. 6-12 



Nov. 13-19 



Nov. 20-26 



Nov. 27-Dec. 3 



Dec. 4-10 



Dec. 11-17 



Dec. 18-24 



Dec. 25-31 



1962 



Jan. 1-7 , 



Jan. 8-14 , 



Jan. 15-21 



Jan. 22-28 



Jan. 29-Feb. 4, 



Feb. 5-11 , 



Feb. 12-18 



Feb. 19-25 



Feb. 26- Mar. 4, 



Afer. 5-11 



ter. 12-18 



1/BlT. 19-25 



Mar. 26-Apr. 1, 

 Apr. 2-8 , 



Total , 



Average . . . , 



Number 



155,270 

 200,710 

 188,780 

 237, 190 

 210, 900 

 253,730 

 276,070 

 238,250 

 253,680 

 207, 170 

 169, 880 

 126,080 

 185,760 



261 

 122 

 360 

 308 

 279 

 233 

 315 

 316 

 232 

 169 

 196 

 173 

 114 

 91 



,770 

 ,660 

 ,720 

 ,500 

 ,900 

 ,380 

 ,600 

 ,800 

 ,500 

 ,800 

 ,350 

 ,390 

 ,780 

 ,400 



5,881,020 

 217, 820 



Number 



8.0 

 7.6 

 5.1 

 5.1 

 5.6 



6. 

 4. 

 9. 

 8. 

 7. 

 7. 

 9. 



.3 

 .1 

 .6 

 .7 

 .1 

 .9 

 .9 

 8.6 

 8.0 

 5.7 

 7.3 

 6.4 

 4.9 

 4.0 



6.7 



Number 



278 

 330 

 298 

 361 

 353 

 264 

 370 

 238 

 400 

 389 

 272 

 270 

 304 



342 

 220 

 528 

 516 

 396 

 422 

 586 

 498 

 457 

 326 

 389 

 350 

 250 

 235 



Number 



?,642 

 357 



503 

 583 

 516 

 653 

 614 

 360 

 723 

 684 

 734 

 679 

 503 

 469 

 500 



642 

 372 

 864 

 913 

 712 

 742 

 1,116 

 868 

 809 

 574 

 705 

 644 

 448 

 438 



17,368 

 643 



Number 



309 

 344 

 366 

 363 

 344 

 705 

 382 

 348 

 346 

 305 

 338 

 269 

 372 



408 

 330 

 418 

 338 

 393 

 315 

 283 

 365 

 287 

 296 

 279 

 269 

 256 

 209 



339 



Number 



559 

 608 

 634 

 657 

 597 

 961 

 746 

 1,001 

 634 

 533 

 625 

 467 

 611 



765 

 558 

 683 

 598 

 707 

 553 

 539 

 636 

 509 

 521 

 505 

 495 

 459 

 389 



610 



Weekly average. 



between sexes when the mean total length 

 was less than 100 mm. 



The mean sizes of bait shrimp in Old Tannpa 

 Bay were snnaller than in lower Tampa Bay 

 (tables 6 and 7). This difference possibly 

 resulted from a difference in salinity; In lower 

 Tannpa Bay, the salinity averages 8 to 10 per- 

 cent higher than in Old Tan-ipa Bay (Saloman, 

 Finucane, and Kelly, 1964), Nunnerous authors 

 (Burkenroad, 1934; Gunter, 1950, 196l;Gunter, 

 Christmas, and Killabrew, 1964; Williams, 

 1955; and Tabb et al., 1962) have found a cor- 

 relation between the size of penaeid shrimp 

 and salinity along the South Atlantic and Gulf 

 coasts of the United States. 



Although my assumption is based in large 

 part on the works of these authors, sonne dis- 

 agreement exists regarding the effect of sa- 

 linity on the growth of shrimp. Lindner and 

 Anderson (1956) found that the size of young 

 shrimp was correlated more with locality than 

 salinity and that the apparent relation between 

 size and salinity did not exist for the four 

 stations from which data were analyzed. Under 

 laboratory conditions, Zein-Eldin (1963) de- 

 termined that postlarval shrimp can survive 

 and grow in a wide range of salinities, and 

 that salinity per se may not play a direct role 

 in growth and survival of postlarval and juve- 

 nile shrimp in estuaries. 



