Sexual Dimorphism, Length-Weight Relationships, Fecundity, and Diet of the Striped Eel Catfish Plotosus lineatus (Plotosidae) on Taiwan’s Southwest Coast ()
ABSTRACT
This study of feeding guild fish from the same coast
of subtropics helps
to suggest conservation of fishery resources. A total of 2,537 specimens of Plotosus
lineatus (Plotosidae) were collected from July 2013 to March 2019 on the coast of Taiwan. The
average total body length (TL) was 23.7 cm ± 4.7 cm and 20.3 cm ± 2.9 cm, and the average body weight (W) was 94.1 g ± 59.6 g and 56.6 g ± 30.8 g among 174 males
and 630 females, respectively. The LWRs of male and female were
ln(W)M = 3.2914 × ln (TL) − 6.0395,
and ln(W)F = 3.0917 × ln(TL) − 5.3629. The male specimens were large than female in TL and W. The
average OSW/TL ratios were 0.722 ± 0.044 and 0.649 ± 0.029 among 41 male and 49
female specimens, respectively. The OSW of the male head was wider than that of the female
head (F = 91.5; p < 0.001), and the head widths of the male fish were significantly more than
those of their female counterparts, causing the OSs to form granular
protrusions. The average CFW/TL ratios were 0.198 ± 0.034 and 0.252 ± 0.032
among the male and female specimens, respectively. The CFW of the male
specimens was narrower than that of the female specimens (F = 58.9; p <
0.001), and the CF gap of the male fish was narrower than that of the female
fish. The P. lineatus exhibits significant sexual dimorphism.
The average eggs number of each female was 2375.6 eggs/individual ± 1140.9 eggs/individual
(N = 161). The major prey of P. lineatus were shrimps, crabs, and
fishes; the total relative frequencies of occurrence of the prey were
57.1%, 32.6%, and 37.2%, respectively (N = 282), and their total relative
abundance levels were 40.2%, 26.3%, and 25.8%, respectively (N = 445). Proper
scientific knowledge management will improve the development of fisheries.
Share and Cite:
Ueng, Y. , Lin, F. , Chan, Y. , Tsao, C. and Chen, M. (2022) Sexual Dimorphism, Length-Weight Relationships, Fecundity, and Diet of the Striped Eel Catfish
Plotosus lineatus (Plotosidae) on Taiwan’s Southwest Coast.
Natural Resources,
13, 77-90. doi:
10.4236/nr.2022.133006.