| Título: | ESTIMATES OF AGE AND GROWTH OF BIGEYE TUNA (THUNNUS OBESUS) IN THE EASTERN PACIFIC OCEAN, BASED ON OTOLITH INCREMENTS AND TAGGING DATA (2006) |
| Titulo original: | ESTIMACIONES DE LA EDAD Y EL CRECIMIENTO DEL ATÚN PATUDO (THUNNUS OBESUS) EN EL OCÉANO PACÍFICO ORIENTAL, BASADAS EN INCREMENTOS DE LOS OTOLITOS Y DATOS DE MARCADO |
| Autores: | Schaefer, Kurt M., Autor ; Fuller, Daniel W, Autor |
| Tipo de documento: | Article : texto impreso |
| En : | Bulletin / Inter-American Tropical Tuna Commission (2006 vol. 23 n° 2, Anual) |
| Idiomas: | Español ; Inglés |
| Resumen: |
Tagging and oxytetracycline hydrochloride (OTC)-marking experiments conducted in the central and eastern Pacific Ocean (EPO) demonstrated that bigeye tuna (Thunnus obesus), in the length range of 38 to 135 cm, deposit daily increments in their sagittal otoliths. Frontal sections, along the primordium to the postrostral axis, of sagittal otoliths provided an optimal counting path for resolving daily increments, with light microscopy, for fish up to 4 years of age. The numbers of increments counted in the sagittae of 254 bigeye (30 to 149 cm), captured by
purse-seine vessels in the EPO between 2000 and 2004, were used as direct estimates of their ages in days. The growth of bigeye in the EPO is described in terms of their length, based on fitting the von Bertalanffy model to the length-at-age data. The models derived for females and males were not significantly different. Equations were also developed to predict age and weight from the length data. Growth of bigeye in the eastern Pacific is also estimated from fitting a von Bertalanffy model to a data set for 205 bigeye tagged in the EPO and recaptured between 2000 and 2004. The growth rate derived from the tagging data was compared with that from the length-at-age data, and the two independent sets of data show similar decreases in growth with increasing length. |
| En línea: | https://www.iattc.org/PDFFiles/Bulletins/_English/Vol-23-No-2-2006-SCHAEFER,%20KURT%20M.,%20and%20DANIEL%20W.%20FULLER_Estimates%20of%20age%20and%20growth%20of%20bigeye%20tuna%20%20Thunnus%20obesus%20%20in%20the%20EPO,%20based%20on%20otolith%20increments%20and%20tagging%20data.pdf |
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