## 3 Results and Discussion  
Table 1 shows the means of the standard length (cm) and the weight (g) of the specimens of each species. _Sparisoma cretense_ is both heavier and longer than _Serranus cabrilla_. Table 2 shows the mean metal concentrations of the two species in each study area, observing that the liver tissue has a higher concentration of metals and trace elements because this is a target organ for toxins and it is where most metals accumulate [27]. \begin{table}
\begin{tabular}{c c c} \hline
**Species** & **Weight (g)** & **Length (cm)** \\ \hline _Sparisoma cretense_ & 158.3 \(\pm\) 52.37 & 21.05 \(\pm\) 2.57 \\ _Serranus cabrilla_ & 97.67 \(\pm\) 29.36 & 19.41 \(\pm\) 2.43 \\ \hline \end{tabular}
\end{table} 
Table 1: Biometric means of the study species. \begin{table}
\begin{tabular}{c c c c c c c} \hline  & \multicolumn{3}{c}{_Serranus atricauda_} & \multicolumn{3}{c}{_Sparisoma cretense_} \\ \hline  & **North** & **East** & **South** & **North** & **East** & **South** \\ \hline Al Muscle & 1.97 \(\pm\) 2.981 & 0.893 \(\pm\) 0.425 & 1.2 \(\pm\) 1.647 & 1.432 \(\pm\) 0.899 & 1.125 \(\pm\) 0.46 & 1.663 \(\pm\) 1.088 \\ Al Liver & 18.57 \(\pm\) 10.07 & 39.97 \(\pm\) 46.11 & 15.12 \(\pm\) 10.31 & 44.64 \(\pm\) 23.77 & 55.66 \(\pm\) 29.82 & 12.18 \(\pm\) 6.063 \\ B Muscle & 0.562 \(\pm\) 0.987 & 0.064 \(\pm\) 0.049 & 0.107 \(\pm\) 0.037 & 0.177 \(\pm\) 0.112 & 0.06 \(\pm\) 0.026 & 0.082 \(\pm\) 0.04 \\ B Liver & 1.397 \(\pm\) 1.131 & 1.116 \(\pm\) 1.12 & 1.029 \(\pm\) 0.471 & 1.787 \(\pm\) 0.594 & 1.33 \(\pm\) 0.92 & 0.452 \(\pm\) 0.188 \\ Ba Muscle & 0.217 \(\pm\) 0.492 & 0.083 \(\pm\) 0.036 & 0.085 \(\pm\) 0.018 & 0.478 \(\pm\) 0.47 & 0.209 \(\pm\) 0.015 & 0.073 \(\pm\) 0.033 \\ Ba Liver & 1.487 \(\pm\) 1.232 & 0.618 \(\pm\) 0.509 & 0.514 \(\pm\) 0.23 & 1.14 \(\pm\) 0.991 & 4.4781 \(\pm\) 5.579 & 0.196 \(\pm\) 0.128 \\ Ca Muscle & 3230 \(\pm\) 1321 & 3477 \(\pm\) 1335 & 3978 \(\pm\) 1224 & 3411 \(\pm\) 2270 & 2188 \(\pm\) 760.7 & 2174 \(\pm\) 1226 \\ Ca Liver & 1837 \(\pm\) 3492 & 445.8 \(\pm\) 675.5 & 428.4 \(\pm\) 234.1 & 1086 \(\pm\) 1060 & 1020 \(\pm\) 1587 & 75.35 \(\pm\) 74.69 \\ Cd Muscle & 0.007 \(\pm\) 0.002 & 0.008 \(\pm\) 0.005 & 0.007 \(\pm\) 0.003 & 0.003 \(\pm\) 0.003 & 0.008 \(\pm\) 0.004 & 0.007 \(\pm\) 0.003 \\ Cd Liver & 0.894 \(\pm\) 0.65 & 1.19 \(\pm\) 1.118 & 0.653 \(\pm\) 0.381 & 0.29 \(\pm\) 0.727 & 0.063 \(\pm\) 0.074 & 0.01 \(\pm\) 0.014 \\ Cr Muscle & 0.075 \(\pm\) 0.026 & 0.095 \(\pm\) 0.031 & 0.103 \(\pm\) 0.036 & 0.132 \(\pm\) 0.11 & 0.149 \(\pm\) 0.266 & 0.071 \(\pm\) 0.019 \\ \hline \end{tabular}
\end{table} 
Table 2: Means and standard deviations (in mg/kg) of _Serranus atricauda_ and _Sparisoma cretense_ according to study area. Figure 1: Map of the sampling zones around the island of Tenerife. The PERMANOVA analysis did not show significant differences in the content of metals and trace elements in the muscle of the species in each location (Table 3). However, the species showed significant differences in the metal content of _Serranus atricauda_ and _Sparisoma cretense_ in the eastern zone in the PERMANOVA analysis of the metal content in the muscle in each zone (Table 4). Table 5 shows the pairwise comparisons between the two species for each metal and trace element in the three study areas. The eastern area is where most metals (Ba, Ca, Cu, K, Mn, Pb and Zn) have significant differences and _S. atricauda_ has the highest concentration of Ca, Cu, K, Pb and Zn. The southern zone resembles the eastern since it also has significant differences in Ca, Cu and Zn, with _S. atricauda_ having the highest concentration of these metals. There were significant differences in Ca, Mn and Zn in the northern zone, with _S. atricauda_ containing the highest concentrations of Cd and Zn. _S. atricauda_ had a higher number of metals with a higher concentration in the three study areas than _S. atricauda_, and this may be due to the fact that _S. atricauda_ is a benthic predator species [28]. Therefore, it feeds on benthic organisms [29], whereas _S.