Translate the following English sentence to French:
"Private contracts between European shipowners and the Guinean Government are often concluded without this form of assistance from the local fishing industry, and contribute to over-fishing due to a lack of controls."
Les contrats privés conclus entre des armateurs européens et le gouvernement de Guinée ignorent le plus souvent cette forme d' aide au secteur piscicole local et favorisent, par l'absence de contrôle, la surpêche.