Observation on the mortality and growth of the mullet (Mugil cephalus) in the Tamiahua lagoon, Mexico

Márquez, Rafael J. Astorga

doi:10.1016/0044-8486(75)90028-9

Cited by 2 publications

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“…Although it is not possible to ascertain the causative factors of such observed differences, a contributing factor would be quantities of harvest; for example, c. 3700 t of M. cephalus compared with 140 t of M. elongatus and 60 t of L. argentea are harvested annually by commercial fishers in NSW (Scandol et al , 2008). Despite the differences in the reported age compositions of harvested mugilid populations, the estimates of Z for M. elongatus (0·92–0·94) were similar to values reported for M. cephalus from the same coastline (0·95; Bell et al , 2005) and studies elsewhere on M. cephalus and L. aurata (Marquez, 1974; Kraljevic & Dulcic, 1996). In comparison, the estimates of Z for L. argentea (0·56–0·61) were relatively low; this species had lower estimated levels of M and F .…”

Section: Discussionsupporting

confidence: 75%

“…. Despite the differences in the reported age compositions of harvested mugilid populations, the estimates of Z for M. elongatus (0·92-0·94) were similar to values reported for M. cephalus from the same coastline (0·95; Bell et al, 2005) and studies elsewhere on M. cephalus and L. aurata (Marquez, 1974;Kraljevic & Dulcic, 1996). In comparison, the estimates of Z for L. argentea (0·56-0·61) were relatively low; this species had lower estimated levels of M and F .…”

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confidence: 75%

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Age validation and variation in growth, mortality and population structure of Liza argentea and Myxus elongatus (Mugilidae) in two temperate Australian estuaries

Kendall

Gray

Bucher

2009

Journal of Fish Biology

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This study investigated variation in the rates of growth and mortality, and age and fork-length (L(F)) compositions of two exploited species of Mugilidae, Liza argentea and Myxus elongatus, in two south-east Australian estuaries (Lake Macquarie and St Georges Basin). An ageing protocol was developed by counting opaque growth zones on sectioned otoliths which was validated by periodically examining the otoliths of captive-reared young-of-the-year fishes, and marginal increment analysis of wild fishes. The maximum recorded age was 17 years for L. argentea and 12 years for M. elongatus, which is greater than generally observed in other species of mugilids. Growth models of each species significantly differed between sexes and, except for male L. argentea, between estuaries. Fishes from Lake Macquarie generally had a greater mean L(F) at age than those from St Georges Basin and females of both species generally attained a greater maximum L(F) and age than males. Gillnet catches of L. argentea were of similar L(F) and age compositions in both estuaries, whereas the age composition of catches of M. elongatus in Lake Macquarie contained a greater proportion of younger fish. Estimates of total, natural and fishing mortality were greater for M. elongatus than L. argentea across both estuaries, and estimates of total mortality were greatest for both species in Lake Macquarie. The data indicate that neither species has been overfished in these estuaries.

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Section: Discussionsupporting

confidence: 75%

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confidence: 75%