Length-dependent changes in egg size and fecundity in females, and brooded embryo size in males, of fork-tailed catfishes (Pisces: Ariidae) from the Sepik River, Papua New Guinea, with some implications for stock assessments

摘要: Data suggest that mature egg weight is positively correlated to female parent length in all five species of fork-tailed catfish studied. Embryo with the male mouthbrooding four where data are available. Non-random mate pairing probably between fish equivalent size. Fecundity appears be linearly related species. There no significant correlation fecundity and weight, because size increases Low fecundities breeding behaviour recruitment likely highly density-dependent stocks vulnerable increased mortality (fishing). Changes may account for deviations from a cube relationship other The relevance this stock assessments discussed. Attention drawn possible changes which could affect fished stocks, depending on specific at caught.