Euthynnus alletteratus, Morphological characters, Meristic
characters, Morphometric differentiation, Tunisian waters.
Our data suggest higher variation in meristic
and morphological attributes than formerly known from previously captured specimens.
The identities of specimens in the American Museum of Natural History verified by electrophoresis, karyotypes, and meristic
data as A.
Values in parentheses represent modes for meristic
counts and means for morphometric ratios.
Otherwise these two species to be almost identical in meristics
and morphometrics except for total gill rakers on the first left gill arch; M.
Identifications of larvae were based on previously published descriptions, illustrations, and meristic
counts provided by Matarese and others (1989) and Mecklenburg and others (2002).
Minimum and maximum values (Min; Max), means (X) and standard deviation (SD) (mm and %) of morphometric and meristic
variables obtained from larvae and juveniles of Clarias gariepinus (LV = yolk-sac larvae: PF = pre-flexion; FL = flexion; FP = post-flexion; J =juvenile; n = number of individuals analyzed; af = absent fin; dv = difficult visualization; nf = unformed).
However, if backcrosses between hybrids and parental stocks do occur in the field, attempts to separate hybrids and their progeny from the parent species would be complicated because hybrid identification using standard morphometric and meristic
measurements depends on the occurrence of intermediate traits (Gilbert, 1961).
Of the char captured (n = 289), 130 were sacrificed, frozen whole in the field, and transported to the Freshwater Institute Laboratory in Winnipeg for biological processing, which included meristic
counts and morphometric measurements as per Reist et al.
Studies on Baltic herring started already in the late 19th century, when on the basis of morphometric and meristic
characters, two races--spring and autumn spawners--were distinguished (Heincke, 1898).
and morphometric data of this fish is lacking for the species present in the Pakistan.
Morphometric and meristic
parameters were made for each specimen as described by Mohsin and Ambak (1983).