Les 1er et 12 juin 2025
Retour sur la petite plage du port du Jaï, bien moins fréquentée que la grande plage un peu plus à l’est, et aux écosystèmes plus variés et riches que les étendues de sable et de palourdes, avec notamment de la zostère bien régénérée depuis la crise anoxique de 2018. On y trouve donc un herbier alternant avec déjà quelques algues vertes, de très nombreuses méduses aurélies (non urticantes dans l’étang de Berre) et des mnemiopsis iridescents un peu moins nombreux, des rochers couverts de moules et parcourus d’innombrables gobies et blennies, mention spéciale pour les blennies paon mâles aux couleurs vives qui évoquent les mers tropicales, des animaux plus curieux que craintifs qui s’approchent dès qu’on cesse de s’agiter ! Une plongée méridienne souvent dans moins d’un mètre d’eau (!), encore claire mais déjà bonne (23°C), à refaire avant que les ulves ne prolifèrent trop et que l’étang ne verdisse trop (sauf dans les zostères). A noter une plongée méridienne quelques jours plus tard vers la Pointe de Berre, dans un site sauvage quoique dégradé par les infrastructures industrielles voisines et le couloir aérien, mais dans de grandes zostères de très faible profondeur…
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anémone verte et anémone asiatique lignée
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gobie noir
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le inénarrables blennies paon mâles en livrée de reproduction, aussi curieux que colorés
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