Revista de Investigación y Desarrollo Pesquero 1986 Nro 5

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Browsing Revista de Investigación y Desarrollo Pesquero 1986 Nro 5 by Subject "Condition factor"

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    Ecología trófica de la anchoíta (Engraulidae, Engraulis anchoita) del Mar Argentino. Parte III. Requerimiento trófico individual en relación con el crecimiento, ciclo sexual y las migraciones estacionales
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 1986) Angelescu, Víctor; Anganuzzi, Alejandro
    The paper was developed in order to arrange the data gathered on this subject and to generate new hypotheses in connection with the trophic strategy of the northern stock of anchovy in the area between latitudes 35°-42°S. Such estimates were finally compared with the values of the gravimetric determinations of stomach contents- as converted to caloric values - of individuals grouped by total-length amd age classes, ecological areas, and seasons of the year. The set of results as obtained conforms the initial basis for developing Part IV of the Trophic Ecology of the Argentine anchovy as related to food consumption estimates, by stock biomass and annual classes, with back-calculations to age class 0, and for applying "regional patterns" that result from the "consumer-food" relationship.
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    Estudio sobre el crecimiento en peso y factor de condición en larvas de anchoíta, Engraulis anchoita Hubbs & Marini. Variaciones regionales, estacionales y anuales
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 1986) de Ciechomski, J.D.; Sánchez, R.P.; Alespeiti, Gabriel; Regidor, H.
    The equation log W=a+bL (where W=dry weight in ug, and L=total length in mm)was used to describe the growth in weight of larval anchovy collected in two areas of the Argentine sea, sampled in different months and several years. Regression lines were compared by covariance analysis applied to two size groups, namely larvae less and over 10 mm total length, as an evident break in the slopes indicated the existence of a chenge of rythm in the trajectory of larval growth in length. Significant differences between the slopes of the growth lines were observed within the smaller size group. No regional or yearly differences could be established fo larvae larger than 10 mm.