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  • 1
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    Studies of the sexual development and spawning of yellowfin tuna, Neothunnus macropterus, and skipjack, Katsuwonus pelamis, in three areas of the Eastern Pacific Ocean, by examination of gonads. (2021)
    In:  http://aquaticcommons.org/id/eprint/2962 | 8 | 2011-09-29 18:05:25 | 2962 | Inter-American Tropical Tuna Commission
    Details
    Publication Date: 2021-06-30
    Description: ENGLISH: Knowledge of the size and age at maturity, spawning seasons, and spawning areas of the tropical tunas supporting the fishery in the Eastern Pacific is an important part of the basic information required for understanding their life history, population structure, and fishery dynamics. Until a few years ago nothing was known of these matters. In 1947 the senior author and one of his colleagues (Schaefer and Marr 1948, Schaefer 1948)were able to demonstrate that both yellowfin tuna and skipjack spawn offshore from Central America at least during the late winter and spring months. During January to April many yellowfin tuna over about 70 cm. total length in commercial catches from that region were found to havegonads in advanced stages of maturity, and specimens caught during late June were found to be spent. Maturing skipjack were collected in late February, and spawned-out fish were observed in late March. Numerous very young juveniles of the yellowfin, down to 10 mm. in length, and two very young juvenile skipjack, were captured in this area between January and May. SPANISH: El conocimiento del tamaño y la edad que corresponden a la primera madurez sexual, así como de las estaciones y áreas de desove de los atunestropicales que mantienen las pesquerías del Pacífico Oriental, constituyen parte importante de la información que es menester para comprender la historia natural, la estructura de la población y la dinámica de la pesquería.Hasta hace pocos años nada se sabía sobre el particular. En 1947 el autor principal y uno de sus colegas (Schaefer y Marr, 1948; Schaefer, 1948) pudieron demostrar que tanto el atún aleta amarilla como el barrilete desovan en el mar abierto, frente a América Central, por lo menos durantela última parte del invierno y en la primavera. De enero a abril encontraron que muchos de los atunes aleta amarilla de más de 70 cm. de longitud total, procedentes de las pescas comerciales de dicha región; tenían gónadasen avanzados estados de madurez, mientras que ejemplares pescados hacia fines de junio ya habían desovado. Se recolectaron barriletes en vías de maduración a fines de febrero, al paso que en los últimos días de marzo seencontraron especímenes que ya habían desovado. Numerosos ejemplares muy juveniles del atún aleta amarilla, tan pequeños como 10 mm., y dos barriletes también muy juveniles, fueron pescados en esta región entreenero y mayo.(PDF contains 65 pages.)
    Description: This article is bilingual and contains both Spanish and English translations.
    Keywords: Fisheries ; sexual development ; spawning ; yellowfin tuna ; Neothunnus macropterus ; skipjack ; Katsuwonus pelamis ; Eastern Pacific Ocean ; gonads ; gonadas ; desarrollo sexual ; desove ; atún aleta amarilla ; barrilete ; Pacífico Oriental
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 281-349
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  • 2
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    Schooling habits of yellowfin tuna (Neothunnus macropterus) and skipjack (Katsuwonus pelamis) in the Eastern Pacific Ocean, as indicated by purse seine catch records, 1946-1955 (2021)
    In:  http://aquaticcommons.org/id/eprint/2628 | 8 | 2011-09-29 18:48:52 | 2628 | Inter-American Tropical Tuna Commission
    Details
    Publication Date: 2021-06-26
    Description: ENGLISH: These aspects of the schooling habits of the yellowfin and skipjack tuna may be investigated by means of the logbook records of the catches of individual sets of the nets of purse-seine vessels. For both purposes it must be assumed that a set is made, in each case, on a single school of fish. The study of school sizes based on these data requires the additional assumption either that the entire school is captured or that each set captures a constant fraction of the school upon which it is made. In this paper we report on the results of such investigations based on logbook records of the purse-seine fleet. SPANISH: Estos aspectos de los hábitos gregarios de los atunes aleta amarilla y barrilete pueden ser investigados a base de los registros de bitácora en que se anotan las pescas resultantes de cada una de las operaciones con la red de encierre que realizan los barcos rederos. Para ambos propósitos hay que suponer que las operaciones se efectúan, en cada caso, en un cardumen independiente. El estudio de los tamaños de los cardúmenes o manchas, a base de estos datos, requiere una suposición adicional: que el cardumen entero es capturado o, en su defecto, que en cada operación con la red se pesca una fracción constante de la mancha objeto de la pesca. En el presente artículo damos cuenta de los resultados de dichas investigaciones basadas en los registros de bitácora que lleva la flota de embarcaciones que utilizan redes de encierre. (PDF contains 47 pages.)
    Description: This article is bilingual and contains both Spanish and English translations.
    Keywords: Fisheries ; Schooling habits ; yellowfin tuna ; Neothunnus macropterus ; skipjack Katsuwonus pelamis ; Eastern Pacific Ocean ; purse seine ; hábitos gregarios ; atún aleta amarilla ; barrilete ; Océano Pacífico Oriental ; redes de encierre
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 81-127
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  • 3
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    Spawning of yellowfin tuna and skipjack in the Eastern Tropical Pacific, as inferred from studies of gonad development (2021)
    In:  http://aquaticcommons.org/id/eprint/3532 | 8 | 2011-09-29 17:14:16 | 3532 | Inter-American Tropical Tuna Commission
    Details
    Publication Date: 2021-06-27
    Description: (PDF contains 70 pages.)
    Description: This article is bilingual and contains both Spanish and English translations.
    Keywords: Fisheries ; spawning ; yellowfin tuna ; skipjack tuna ; Eastern Tropical Pacific ; gonad development ; desove ; atunes aleta amarilla ; barrilete ; Pacifico Oriental Tropical ; desarrollo de las gónadas
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 457-526
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