Habitat associations, reproduction and diet of the Guinean tilapia Tilapia guineensis of the Gambia River floodplains.
Habitat associations, reproduction and diet of the Guinean tilapia Tilapia guineensis of the Gambia River floodplains.
复制标题
冈比亚河漫滩的几内亚罗非鱼 Tilapia guineensis 的栖息地关联、繁殖和饮食。
DOI：
10.1111/j.1095-8649.2010.02634.x
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发表时间：
2010
影响因子：
2
通讯作者：
Lucas,MC
中科院分区：
文献类型：
--
作者：
Louca,V;Lindsay,SW;Piyapong,C;Lucas,MC
对冈比亚河下游洪泛区的主要鱼种几内亚罗非鱼（Tilapia guineensisa）的生态进行了研究，以更好地了解在冈比亚河上修建拦河坝所造成的威胁。单位努力渔获量（CPUE）的T。guineensis与电导率和溶解氧呈正相关，与水深和植被覆盖率呈负相关。饮食研究表明T. guineensisis主要是一种噬髂体。繁殖高峰期在雨季开始时。CPUE在5月达到峰值，就在第一场降雨之前，随后下降，可能反映了新淹没的栖息地的运动。成熟时的中位体长为11.6 cm（LT），雌性为12.5 cm（LT），雄性为12.5 cm（LT）。LT频率分析表明，每个月都会有几个幼鱼群以及非常年轻的鱼出现在洪泛平原上，这表明整个雨季都在继续繁殖。即将在冈比亚河上建造一座水电站大坝可能会影响到T。几内亚敏感地通过预期的河流水文变化来进行监测。
The ecology of the Guinean tilapiaTilapia guineensisa dominant species of the lower Gambia River floodplains and an important food source in parts of West Africa was studied to better understand the threat posed from construction of a barrage across the river. The catch per unit effort (CPUE) ofT. guineensiswas positively associated with conductivity and dissolved oxygen and negatively associated with water depth and the % vegetation cover. Diet studies indicated that theT. guineensisis primarily an iliophage. The peak of reproduction was at the beginning of the rainy season. CPUE peaked in May, just before the first rains, and subsequently declined, probably reflecting movement into newly flooded habitat. Median size at maturity was 11·6 cm total length,LT, for females and 12·5 cmLTfor males.LT‐frequency analysis indicated several juvenile cohorts as well as very young fish on the floodplains each month, suggesting continuation of reproduction throughout the rainy season. The impending construction of a hydroelectric dam on the Gambia River is likely to affectT. guineensisnegatively through anticipated changes in the hydrology of the river.