. Pesca commerciale di revisione. La pesca e il commercio di pesce. 49 Tagging Alosa: annuale rilascia e stimato Re anno coveries Ubicazione rilascia recuperare ies numero Percentuale Numero di 1966 Atlantico 11,262 96,627 11.7 1967 Atlantico 91,083 363,061 25.1 1968 Atlantico 84,106 385,994 21.8 1969 ^ ^ Atlantic > Golfo 220,675 35, 198 16,586 6,860 7,5 19,5 Totale: Atlantico 203,037 1,066,357 19,0 Golfo 35,198 6,860 19,5 recuperi Tag indicano che gli uomini Atlantico- haden spostare verso nord lungo la costa in primavera e in estate e verso sud lungo la costa in autunno e in inverno. Come i pesci più grandi e più grandi, esse migra

• Collaboratore: The Book Worm / Alamy Foto Stock
• ID dell’immagine: REGYCX
• Dimensioni dei file: 7,1 MB (214,9 KB Download compresso)
• Liberatorie: Modello - no | Proprietà - no
• Dimensioni: 2865 x 872 px | 24,3 x 7,4 cm | 9,6 x 2,9 inches | 300dpi

Altre informazioni

Questa foto è un'immagine di pubblico dominio, il che significa che il copyright è scaduto o che il titolare del copyright ha rinunciato a tale diritto. Alamy addebita un costo per l'accesso alla copia ad alta risoluzione dell'immagine.

Questa immagine potrebbe avere delle imperfezioni perché è storica o di reportage.

. Commercial fisheries review. Fisheries; Fish trade. 49 Menhaden Tagging: Yearly Releases and Estimated Re coveries Year Location Releases Recover ies Number Number Percent 1966 Atlantic 96, 627 11, 262 11.7 1967 Atlantic 363, 061 91, 083 25.1 1968 Atlantic 385, 994 84, 106 21.8 1969 ^ ^ Atlantic ~> Gulf 220, 675 35, 198 16, 586 6, 860 7.5 19.5 Total: Atlantic 1, 066, 357 203, 037 19.0 Gulf 35, 198 6, 860 19.5 Tag recoveries indicate that Atlantic men- haden move northward along the coast in spring and summer, and southward along the coast in fall and winter. As the fish get older and larger, they migrate farther north. Tags continue to be recovered from fish released in 1966. This proves that fish can survive for an extended period with an internal tag. Actual recoveries from some groups of marked fish have been higher than 60%. Through October 1969, more than 35, 000 menhaden have been tagged and released along the Gulf coast from Cameron, La., to Moss Point, Miss. We estimate that nearly 6, 900 tagged fish, or 19% of those released, have been recaptured (table). This percentage also will increase when we make adjustments for tag shedding and tagging mortality. These data did not show much movement of tagged fish in the Gulf during their first summer after tagging. Some westward move- ment of fish released at Empire, La., was apparent; some Cameron releases may have moved east as far as Empire, but not as far as Moss Point. Recoveries in 1970 will pro- vide our first information on movements of Gulf menhaden in the period between fishing seasons. To estimate rates of mortality and growth from tag returns, recoveries are needed from several years of fishing. The determination of the amount of movement between fishing areas also requires several years of recov- eries. Information obtained from these studies of Atlantic and Gulf menhaden will help us to uti- lize wisely the menhaden resources.. Please note that these images are extracted from scanned page images that may have be

Parole chiave associate all'immagine

• bookcentury1900
• booksubjectfisheries
• booksubjectfishtrade
• libro