Relación de las Toninas, Tursiops Truncatus, y las toninas moteadas, Stenella frontalis, con la actividad camaronera en la Sonda de Campeche, México

Abstract

TWO SURVEYS WERE MADE ON SHRIMP SHIPS (JUNE AND OCTUBER, 1989) TO RECORD THE ACTIVITIES AND ITERACTIONS WITH FISHERIES OF BOTTLENOSE DOLPHINS TURSIOPS TRUNCATUS AND ATLANTIC SPOTTED DOLPHINS STENELLA FRONTALIS IN THE CAMPECHE SOUND, MEXICO. DURING 157 HOURS AND 33 DAYS (11 ON JUNE AND 22 ON SEPTEMBER - OCTOBER) 687 BOTTLENOSE DOLPHINS (5.5% OF CALVES ONLY IN JUNE) AND 257 SPOTTED DOLPHINS (4.2% OF CALVES) WERE SIGHTED. THE DOLPHINS STAYED BEHIND OF THE SHRIMP SHIPS AND ATE THE BYCATCH (PRINCIPALLY AT NIGHT). BECAUSE OF THE POSITION OF THE DOLPHINS IN RELATION WITH THE TRAWL NETS, LOW POSSIBLILITIES OF INCIDENTAL TRAWLING STAGES BUT NOT DEPENDING EXCLUSIVELY ON THE BYCATCH DISCARD AFTER THE TRAWL.. THE MEAN SCHOOL SIZE OF S. FRONTALIS WAS LARGER THAN THAT OF T. TRUNCATUS. BOTTLENNOSE DOLPHINS HAD A WIDE ALTITUDINAL DISTRIBUTION.