A study of the dynamics of the fishery for yellowfin tuna in the Eastern Tropical Pacific Ocean

(PDF contains 43 pages.)

Spawning of yellowfin tuna and skipjack in the Eastern Tropical Pacific, as inferred from studies of gonad development

(PDF contains 70 pages.)

Fecundity of yellowfin tuna (Thunnus albacares) and skipjack (Katsuwonus pelamis) from the Eastern Pacific Ocean

(PDF contains 36 pages.)

Surface currents of the Eastern Tropical Pacific Ocean

(PDF contains 39 pages.)

Reproductive biology of black skipjack, Euthynnus lineatus, an Eastern Pacific tuna

(PDF contains 94 pages.)

Biometric comparison of the anchoveta, Cetengraulis mysticetus (Gunther), from ten localities of the Eastern Tropical Pacific Ocean

ENGLISH: It is important to the Inter-American Tropical Tuna Commission to know whether the anchoveta (Cetengraulis mysticetus), the principal tuna bait species in the Eastern Tropical Pacific Ocean, is composed of one or several populations. Earlier research indicated that, on the basis of significant differences in certain meristic counts, populations of this species in six of the major baiting localities between Mexico and Peru, should provisionally be considered as separate stocks. Since that time, additional collections of anchovetas have been obtained from these and other intervening localities. Purpose of the present study was to confirm the results of the earlier work, and to determine whether the differences in the meristic counts persisted from year to year, as well as to examine certain morphometric characters of the fish from these areas, and to learn whether the populations from the other localities are also separate entities. SPANISH: La Comisión Interamericana del Atún Tropical está interesada en saber si la anchoveta (Ceteugrautís mvsticetus}, la principal especie usada como cebo para la pesca del atún en el Océano Pacífico Oriental Tropical, está compuesta de una o de varias poblaciones. Investigaciones previas indicaron que, a base de diferencias significativas encontradas en ciertos caracteres numéricos, las poblaciones de esta especie en seis de las principales localidades entre México y Perú, podían ser consideradas provisionalmente como pertenecientes a "stocks'' separados. Desde entonces se han venido haciendo recolecciones adicionales de anchovetas en éstas y otras localidades intermedias. El propósito del presente trabajo ha sido confirmar los resultados obtenidos previamente, y determinar si las diferencias en los caracteres numéricos han persistido de un año a otro, así como examinar ciertos caracteres morfométricos en los peces de estas áreas, y resolver si las poblaciones de las nuevas localidades muestreadas son también entidades diferentes. (PDF contains 76 pages.)

Some observations on bigeye tuna (Thunnus obesus) caught by the surface and longline fisheries for tunas in the Eastern Pacific Ocean

(PDF contains 58 pages.)

Statistics of the Eastern Pacific Ocean tuna fishery, 1979 to 1992

ENGLISH: This report, published in response to the large volume of requests for information received by the IATTC, provides information on the catches, effort, and composition of the purse-seine and baitboat fleets which fished for tunas and tuna-like species in the eastern Pacific Ocean (EPO) in the 1979-1992 period. It does not include data for longline fisheries operating in the EPO; that information may be found in the IATTC's Annual and other reports. The IATIC has published similar data for other periods in its Bulletin series (Shimada, 1958; Alverson, 1959, 1960, ~963; Martin, 1962; Calkins and Chatwin, 1967, 1971; Calkins, 1975; Orange and Calkins, 1981) and in its weekly, quarterly, and annual reports. SPANISH: El presente informe, publicado como resultado del gran volumen de solicitudes de información recibidas por la CIAT, presenta información sobre las capturas, el esfuerzo, y la composición de las flotas que pescaron atunes y especies afines con red de cerco o carnada en el Océano Pacífico oriental (OPa) en el período de 1979-1992. La CIATha publicado datos similares para otros períodos en su serie de Boletines (Shímada, 1958; Alverson, 1959, 1960, 1963; Martin, 1962; Calkins y Chatwin, 1967, 1971; Calkins, 1975; Orange y Calkins, 1981) y en sus informes semales, trimestrales, y anuales. (PDF contains 102 pages.)

Geographical distributions of effort and catches of tunas by purse-seine vessels in the Eastern Pacific Ocean during 1965-1998

ENGLISH: This report presents fine-scale spatial summaries of annual catch and effort information compiled by the IATTC staff. These data summaries are presented in a graphical format, and display only information collected from purse-seine vessels fishing in the eastern Pacific Ocean (EPO) during 1965-1998. Data collected from baitboat and longline vessels fishing in the EPO are not considered in this report. Equivalent data from Japanese longline vessels fishing in the EPO are presented by Uosaki and Bayliff(1999) for 1988-1992 and by' references cited in that publication for 1956-1987. SPANISH: Este informe presenta resúmenes espaciales a escala fina de información sobre captura y esfuerzo anuales compilada por el personal de la CIAT. Se presentan los resúmenes en formato gráfico, e incluyen solamente información tomada de barcos cerqueros pescando en el Océano Pacifico oriental (OPO) durante 1965-1998. No se consideran en el informe datos provenientes de barcos de camada y palangreros que pescan en el OPO. Se presentan datos equivalentes de barcos palangreros japoneses pescando en el OPO en Uosaki y Bayliff (1999) para 1988-1992 yen las referencias citadas en dicha publicación para 1956-1987. (PDF contains 104 pages.)

Das Klima um Grönland - 1996

Based on air temperature data from three sites of West and East Greenland, on ice charts for the area 54°N, 71°N and 20°W, 70°W, and on CTD profile observations around Greenland, the annual variability of climate is shown. Mean monthly air temperature data from Nuuk/West Greenland reveal the long-term interannual changes of air temperature anomalies. The warming trend which was observed during November, December 1995 was maintained into 1996 for about five months. Thus, spring warming of the near surface water layers, especially on the shallow bank areas off West Greenland has been favoured. As a result of mild air temperatures over most of 1996, sea ice conditions were about normal around Greenland and off eastern Canada. Subsurface observations indicate considerable warming of the 0-200 m water layer off West Greenland. The thermal anomaly of this layer amounts to +1.59K, which is the second highest value on record since the warm 1964 event. The warmer than normal conditions as recorded since November 1995 off East and West Greenland, point at intermediate warming which is characteristic of the second half of the recent decades. The long-term trend of air temperature anomalies off West Greenland points, however, still at cooling, a trend which is persistent since the early 1970s. As the potential driving mechanism for the intermediate warming in the Labrador Sea area, the sea level air pressure gradient between Iceland and the Azores is identified. The 1996 value of this gradient, the North Atlantic Oscillation (NAO) Index, is strongly negative and this represents the flow of mild air masses from the midlatitude Atlantic Ocean to the Greenland/Labrador Sea region. Accordingly, air temperature anomalies indicated unusual warming during the month of February which amounted to >2K in the region of Baffin Land, Labrador and Greenland.

Report of the Inter-American Tropical Tuna Commission for the year 1967

ENGLISH: The Inter-American Tropical Tuna Commission was created and operates under the authority of a Convention first negotiated between the governments of the Republic of Costa Rica and the United States of America. The Convention entered into force in 1950. It is open to adherence by other governments whose nationals fish for tunas in the eastern Pacific area. Under this provision, Panama adhered in 1953, Ecuador in 1961, the United Mexican States in 1964. Canada applied for membership in 1967. Her membership will become effective on April 1, 1968. On August 21, 1967 the Ecuadorian government, for financial reasons, elected to withdraw from active membership. Under Convention ruling, this means that she remains a full member until August 21, 1968. SPANISH: La Comisión Interamericana del Atún Tropical fue originada y está bajo la autoridad de una Convención que fue negociada inicialmente entre los gobiernos de la República de Costa Rica y los Estados Unidos de América. La Convención entró en vigencia en 1950. Está abierta a la afiliación de otros gobiernos cuyos ciudadanos pescan atunes en el área del Pacífico oriental. Bajo esta estipulación, Panamá se afilió en 1953, Ecuador en 1961 y los Estados Unidos Mexicanos en 1964. Canadá presentó su ap1licación en 1967. Su afiliación será efectiva el 1 de abril de 1968. El 21 de agosto de 1967, el gobierno ecuatoriano por razones financieras decidió retirar su participación activa. Bajo las reglas de la Convención el Ecuador sigue actuando como miembro hasta el 21 de agosto de 1968. (PDF contains 144 pages.)

Report of the Inter-American Tropical Tuna Commission for the year 1968

ENGLISH: The Inter-American Tropical Tuna Commission operates under the authority and direction of a Convention originally entered into by the Republic of Costa Rica and the United States of America. The Convention, which came into force in 1950, is open to adherence by other governments whose nationals fish in the eastern tropical Pacific. Under this provision the Republic of Panama adhered in 1953, the Republic of Ecuador in 1961, the United Mexican States in 1964 and Canada in 1968. In 1967 Ecuador gave notice of her intent to withdraw from the Commission and her withdrawal became effective on August 21, 1968. SPANISH:La Comisión Interamericana del Atún Tropical está bajo la autoridad y dirección de una Convención la cual fue originalmente formada por la República de Costa Rica y los Estados Unidos de América. La Convención, vigente desde 1950, está abierta a la afiliación de otros gobiernos cuyos nacionales pesquen en. el Pacífico oriental tropical. Bajo esta medida la República de Panamá se afilió en 1953, la. República del Ecuador en 1961, los Estados Unidos Mexicanos en 1964 y' el Canadá en 19Ei8. En 1967, el Ecuador anunció su intención de retirarse de la Comisión y la resignación se hizo efectiva el 21 de agosto de 1968. (PDF contains 128 pages.)

Report of the Inter-American Tropical Tuna Commission for the year 1969

ENGLISH: The Inter-American Tropical Tuna Commission operates under the authority and direction of a convention originally entered into by the Republic of Costa Rica and the United States of America. The convention, which came into force in 1950, is open to adherence by other governments whose nationals fish for tropical tunas in the eastern Pacific Ocean. Under this provision the Republic of Panama adhered in 1953, the Republic of Ecuador in 1961, the United Mexican States in 1964 and Canada in 1968. In 1967, Ecuador gave notice of her intent to withdraw from the Commission, and her withdrawal became effective on August 21, 1968. SPANISH: La Comisión Interamericana del Atún Tropical está bajo la autoridad y dirección de una convención la cual fue originalmente formada por la República de Costa Rica y los Estados Unidos de América. La Convención, vigente desde 1950, está abierta a la afiliación de otros gobiernos cuyos nacionales pesquen túnidos en el Pacifico oriental tropical. Bajo esta medida la República de Panamá se afilió en 1953, la República del Ecuador en 1961, los Estados Unidos Mexicanos en 1964, y Canadá en 1968. En 1967, el Ecuador anunció su intención de retirarse de la Comisión y la renuncia se hizo efectiva el 21 de agosto de 1968. (PDF contains 117 pages.)