Age, growth, length–weight relationship, sex ratio and food habits of the Argentine pejerrey, Basilichthys bonariensis (Cuv. and Val.), from Lake Peñuelas, Valparaíso, Chile

Abstract

Age, growth, length-weight relationship, sex ratio and food habits of the Argentine pejerrey, Basilichthys bonariensis (Cuv. and Val.), from Lake Peiiuelas, Valparaiso, ChileArgentine pejerreys were collected in Lake Pefiuelas during January 1973. Calculated growth rate was maximum during the 3rd year of life. The length-weight relationship was:log W=-5.69395+3.25248 log L, where W=weight (g), and L=total length (rnm). Agegroup I was sexually mature. The sex ratio was 85 males (54%) to 73 females (46%). Young-of-the-year pejerreys fed primarily on copepods, but cladocerans [Bosmina sp. (Baird), Diaphanosonza brachyurum (Likven), Simocephalus serrulatus (Koch)], ostracods, and dipterans were also represented. Feeding occurred during daylight. w x 105 K = -299 L3

Biologia reprodutiva do peixe-rei Odontesthes argentinensis (Valenciennes) (Atherinopsidae) da região marinha costeira do sul do Brasil

“…Em O. argentinensis as fêmeas foram predominantes nas maiores classes de tamanho, supondo que a taxa de crescimento das fêmeas é maior que a dos machos, e assim, estar ocorrendo uma seleção predativa que pode alterar a proporção sexual diminuindo o número de machos. Outros autores como CIECHOMSKI (1972), BURBIDGE et al (1974) e MORENO et al (1977 também encontraram predomínio de fêmeas ao estudarem outras espécies de peixe-rei, sendo a proporção sexual variável para cada espécie.…”

Fish‐flamingo‐plankton interactions in the Peruvian Andes1

“…(e.g. Ringuelet 1942;Burbidge et al 1973;Bahamondes et al 1979). The diet of S. gairdneri in Lake Titicaca consists primarily of amphipods, gastropods, insects, Orestias spp., B. bonariensis, T. dispar, and tadpoles of Telmatobius sp., with fish constituting about 77% (by volume) of the diet of S. gairdneri longer than 30 cm (Everett 1973;Hanek et al 1982;Bustamante and Trevifio 1975).…”

Age and growth of three Odontesthes species from Southern Brazil (Atherinopsidae), with reference to phylogenetic constraints in their life-history

“…Considering the available data for South American silversides, it has not been possible to discern any pattern in age and growth relative to latitude, geographic proximity of species or type of habitat (marine x freshwater). The results of studies on different O. bonariensis populations (Burbidge et al, 1974;Freyre, 1976;Vila & Soto, 1986;Sverlij & Arceredillo, 1991) suggest that age and growth characteristics in Odontesthes are highly dependent on environmental conditions. For the above reasons, and because growth parameters and age structure are known to vary among populations in many other species (Bagenal & Tesch, 1978;Wootton, 1990), these characteristics are not adequate for taxonomical purposes.…”

“…Sorgentinin silversides present some common life history characteristics that distinguish them from the majority of other members of the family and from most Atherinidae. The Sorgentinini typically present a long life-cycle, ranging from 3 to 10 years, and maximum total lengths between 150 and 750 mm (Ciechomski, 1972;Burbidge et al, 1974;Freyre, 1976;Vila et al, 1981;Villavicencio & Muck, 1984;Klink & Eckmann, 1985;Vila & Soto, 1986;Bemvenuti, 1987;Elías et al, 1991;Fialho, 1992). The life-cycles of other Atherinopsidae (subfamily Menidiinae and tribe Atherinopsini) and of the Atherinidae seldom extend 3 years, and individuals rarely attain more than 120 mm in length (see Turnpenny et al, 1981;Hubbs, 1982;Milton & Arthington, 1983;Palmer & Culley, 1983;Prince & Potter, 1983;Conover, 1985;Potter et al, 1986;Warkentine & Rachlin, 1987;Creech, 1992b).…”