Measurements of closely related sets of classical and truss dimensions were analyzed to discriminate species of scorpaenidae including the dark banded rockfish, Sebastes inermis, the black rockfish, S. schlegeli, and gobioninae including the striped shiner, Pungtungia herzi, and the slender shiner, Pseudopungtungia tenuicorpa. The measurements of the dimensions were arc sin square root transformed, and compared as a function of the standard length of each species for statistical analysis. For values of the classical dimensions of the rockfish, 6 were greater for the dark banded rockfish than for the black rockfish, 1 value was smaller for the former, and for 2 values there was no statistically significant difference (P > 0.05). For values of the classical dimensions of the shiners, 9 values were greater for the striped shiner than for the slender shiner, 2 values were smaller for the former, and for 1 value there was no statistically significant difference (P > 0.01). For values of the truss dimensions of the rockfish, 6 were greater for the dark banded rockfish than for the black rockfish, 1 was smaller for the former, and for 4 values there was no statistically significant difference (P > 0.05). For values of the truss dimensions of the shiners, 13 values were greater for the striped shiner than for the slender shiner, 3 values were smaller for the former, and for 6 values there was no statistically significant difference (P > 0.01). The dimension sets used in this study may be useful as taxonomic indicators for discriminating among fish species in Korea.
We assessed the effects of various dietary conditions on the growth, phenotypic traits, and morphometric dimensions of rock bream, Oplegnathus fasciatus and on the morphometric dimensions of sectioned olive flounder, Paralichthys olivaceus. Rock bream in the fed group increased in body weight, standard length, and condition factor, but these parameters decreased significantly for fish in the starved group (P < 0.05). The head connection dimensions of fish in the fed group decreased, while for starved fish there was increase in external morphometric dimensions (P < 0.05). In both species, sectioned morphometric analysis revealed that fish in the fed group had a larger body circumference and cross-cut sectional area, and greater cross-cut section height, relative to the starved group (P < 0.05).
We investigated the physiological responses of the river puffer, Takifugu
obscurus, the tiger puffer, T. rubripes, a hybrids
of the two (river puffer×tiger puffer) and a hybrid triploids to acute
changes of salinity from 30 psu to 0 psu and from 0 psu to 30 psu. The blood and
plasma factors of each species were elevated for 48, 72, or 96 hrs, and
thereafter decreased due to hyper-osmoregulation and hypo-osmoregulation. In
hyper-osmoregulation and hypo-osmoregulation, the cortisol concentration of
river puffer, hybrids, hybrid triploids and tiger puffer increased for 12 or 48
hrs, and decreased thereafter. Chloride cells in the gill filaments of each
species increased with increasing salinity, and melano-macrophages in the kidney
tissue of each species increased with decreasing salinity. In conclusion, the
hematological and stress responses of the hybrids were between those of the
river puffer and tiger puffer, and the hematological responses of the hybrid
triploids were higher than those of the other groups. The stress response of the
hybrids was more sensitive than that of the hybrid triploids. In all groups, the
histological responses of kidney in hyper-osmoregulation were more sensitive
than those in hypo-osmoregulation.
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