A new species of Larimichthys from Terengganu, east coast of Peninsular Malaysia is described from specimens collected from the fish landing port at Pulau Kambing, Kuala Terengganu. Larimichthys terengganui can be readily distinguished from other species of the genus by having an equally short pair of ventral limbs at the end of the gas bladder appendages, which do not extend lateral-ventrally to the lower half of the body wall, and fewer dorsal soft rays (29-32 vs. 31-36) and vertebrae (24 vs. 25-28). Larimichthys terengganui can be distinguished from L. polyactis and L. crocea by having a gill raker at the angle of first gill arch shorter than the gill filament. Furthermore, the second anal spine in L. terengganui is equal or slightly shorter than eye diameter (vs. shorter in L. polyactis); L. terengganui has 8-9 anal soft rays (vs. only 7 in L. pamoides). Snout length of L. terengganui is greater than eye diameter, whereas in L. crocea the snout is shorter than eye diameter. A key to species of Larimichthys is provided. All obtained specimens of the species were recorded from Terengganu waters, east coast of Peninsular Malaysia.

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Terubok (Tenualosa toli) is one of Malaysia commercially important fish which is found mainly in Sarawak. Their numbers of catch have been declining in the past 15 years due to heavy exploitation. Hence, a study was done to determine the mitochondrial genetic diversity of T. toli from Daro and Mukah, Sarawak inferred by partial Cytochrome b gene. DNA extraction was done on 84 T. toli samples. PCR amplification using Cyt-b primers had been carried out and sequence of 469 bp length was obtained from each sample. Next, phylogenetic analysis was performed to study the relationship among the individuals. The genetic diversity of the population was determined through the haplotype and nucleotide diversity. Result of the study showed that the Haplotype Diversity (HD) of T. toli was relatively low for Daro (Hd = 0.232) and Mukah populations (Hd = 0.178). The nucleotide diversity was also low for both populations. Moreover, only nine haplotypes were identified from the 84 individuals. A single haplotype was shared amongst 76 individuals. These findings correlate with previous study that showed the number of the fish caught had declined drastically and might cause a genetic deprivation towards its population. Comparably, maximum likelihood analysis revealed that two T. toli individuals were separated from the main clade, suggesting that these two individuals might come from another Terubok population. Genetic diversity of the mitochondrial DNA Cytochrome b of the T. toli obtained in this study would be useful in the implementation of conservation and fisheries management of this species in Sarawak.