Effect of female size on fecundity and egg size in white‐spotted charr: comparison between sea‐run and resident forms

Abstract

The relationships between fecundity, egg size and female size of sea-run form were compared with resident form, using white-spotted charr, Salvelinus leucomaenis. Both fecundity and egg size increase with female size. However, the relationship between egg size and female size differed significantly between the resident and sea-run forms. Egg sizes of sea-run and resident were similar even though sea-run fish were much larger. 1998 The Fisheries Society of the British Isles

Loggerhead turtle (Caretta caretta) offspring size does not vary with maternal alternative foraging behaviors: support for their phenotypic plasticity

“…In some cases, prey quality or quantity is positively correlated with offspring size (Kaplan 1987;Warner and Lovern 2014), whereas, in other cases, it inversely affects offspring size (Reznick and Yang 1993;Jonsson et al 1996;Warner et al 2007;Iguchi 2012). Other works have shown a lack of correlation between prey and offspring size (Morita and Takashima 1998;da Costa Araújo et al 2013). In the present study, we found the morphology of loggerhead hatchlings did not vary with maternal food environment, which was consistent with our previous inference from similar egg characteristics (size and nutritional components) between oceanic and neritic foragers (Hatase et al 2014).…”

Size at maturity of fluvial white-spotted charr, Salvelinus leucomaenis, around the Lake Biwa water system varies with habitat size

“…Therefore, the applicability of Stearns' rule 2 (Stearns 1983(Stearns , 1992, in which individuals mature at a specific age, could not be excluded. In such a situation, smaller size at maturity in smaller habitats does not result from adaptive phenotypic plasticity; instead, it leads to a decreased spawning biomass, because fecundity in white-spotted charr increases with female size (Morita and Takashima 1998). Thus, further research is needed to determine not only the growth rate but also the age at maturity.…”

Genetic evaluation of translocation in artificially isolated populations of white-spotted charr (Salvelinus leucomaenis)

“…of the migrant females was 398 ± 67 mm for the Kame River, and 306 ± 36 mm for the Hitozuminai River. According to the fish size-egg number relationship (Morita and Takashima, 1998), the total egg mass of the released fish was estimated to be 10,963 eggs for the Hitoziuminai River and 18,280 eggs for the Kame River. On 7 July 2003, fifty 0+ fish were also collected at two translocation sites of the Kame and Hitozuminai rivers.…”