Forward part of the head, anterior to the eye (Rodriguez, J.M. 2023. Eggs and larvae of common marine fish species of northwest Africa. FAO, Rome. https://doi.org/10.4060/cc7700en)
Butroxydim is an obsolete herbicide. It has a low aqueous solubility, is relatively volatile and, based on its chemical properties, is non-mobile and would not be expected to leach to groundwater. It is generally non-persistent in soil systems but may persist in aquatic systems under certain conditions. CAS Registry Number 138164-12-2 (Lewis, K.A., Tzilivakis, J., Warner, D. and Green, A. (2016) An international database for pesticide risk assessments and management. Human and Ecological Risk Assessment: An International Journal, 22(4), 1050-1064. DOI: 10.1080/10807039.2015.1133242 and PubChem https://pubchem.ncbi.nlm.nih.gov/compound/135405255)