It will suffice to say that the court in that case held that the provision of the constitution under consideration is mandatory, notwithstanding the employment of the word "may" therein. In the case of In re Cole, 12 Cal.App. 290, [ 107 P. 581], while not necessary therein to decide the question, this court, nevertheless, in considering the effect of section 25 1/2 of article IV of the constitution, strongly intimated that its language and terms were mandatory. The court had under consideration an ordinance of Sonoma County prohibiting the catching of fish in rivers, streams, or sloughs in said county.