Factors influencing the emigration of juvenile Bonga from the Cross River estuary

Studies were conducted to identify and quantify the proximate factors responsible for the emigration of juvenile bonga Ethmalosa fimbriata (Bowdich, 1825) from the Cross River estuary. A time series of bonga cpue, salinity, turbidity and plankton abundance was undertaken, juvenile bonga was abundant in the estuary when salinities ranged between 1 and 9ppt. at salinities outside this range, they were absent. We conclude that salinity is the proximate factor that initiates the emigration of juvenile bonga from the estuar

Element characterization of african cuttlefish, Sepia bertheloti from the coastal waters off Qua Iboe River, Nigeria, using energy dispersive x-ray flourescence technique

Ten samples of African Cuttlefish, Sepia bertheloti, collected from the coastal waters off Qua Iboe River Nigeria, were analyzed using Energy Dispersive X-ray Fluorescence (EDXRF) analytical technique to determine their elemental composition. Eleven elements namely, CI, Sr, K, Ca, Br, Fe, Cu, Zn, Mn, Ni, and Se are identified and their relative concentration found. Of these elements, CI, Sr and Ca are present at the highest concentrations of 1.37 2.55 (1.86%), 1.15 - 2.10 (1.64%) and 0.09 - 0.43(0.31%), respectively. This is followed by K, Br. Fe, Zn, Cu, Mn, Ni and Se in decreasing order. Result further showed that at a daily consumption rate of 100 g/day, the values of the elements in the sea food are close to the US recommended dietary reference intakes for people of different age groups. These elements are of great nutritional value for proper and healthy growth of humans. The accuracy and precision of the technique were assured by analyzing the BCR referencematerials BCR 185 (bovine liver), and BCR 186 (pig kidney)