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Bigeye grunt Brachydeuterus auritus is an important economic species in the waters off Sierra Leone in West Africa, with great ecological value. Based on bottom trawl survey data from six voyage samples collected between 2019 and 2021, the body weight-length relationship (WLR) and relative weight were analyzed using logarithm-transformed body length measurements and their corresponding mean body weight values. This study fitted the WLR of bigeye grunt by gender, calculated its fullness, and analyzed the influence of environmental factors. The results showed that month and gender had a significant impact on body length and weight distribution (P < 0.01). There was a highly significant negative correlation (P < 0.01) between value a and value b in the WLR, and salinity significantly affects value b (P < 0.05). The (lg a)/b ratio was less affected by environmental factors which may be related to the body size and density of the fish. The difference in b between male and female populations was highly significant (P < 0.01). The relative weight had significant seasonal variation characteristics, with highly significant effects of sex and body length (P < 0.01). Negative allometric growth was observed in September, October, and December, while positive allometric growth occurred in January, April, and May. With increasing body length, the relative weight showed two types of changes, continuously increasing and firstly increasing then decreasing, with salinity and b significantly affecting the type of change (P < 0.05) and depth having a highly significant effect (P < 0.01). The bigeye grunt off the coast Sierra Leone exhibited significant seasonal growth characteristics, with significant differences in growth characteristics between male and female individuals. This study suggested that salinity may be the main factor affecting its growth and development. In addition, this study hypothesised that the peak breeding season may occur during the dry season, beginning in December and ending before April of the following year. The study provides updated and more comprehensive insights into the biology and ecology of the bigeye grunt offshore Sierra Leone in West Africa, which can provide scientific basis for its resource assessment, development and utilization, and resource management.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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