The oceans cover 71% of the earth's surface and provide us with food, oxygen and work. However, they are perhaps the least understood, most biologically diverse, and most underrepresented of all ecosystems. Sea systems provide us with essential services. CO₂ capture for climate protection, renewable energy and storm surge protection, just to name a few. As the world's population grows, we dig deeper and deeper into the oceans in search of fish, oil, gas, minerals and new genetic resources to keep up with increased consumption. Estimating the total value of marine ecosystems provides policy makers with a strong rationale for improving ocean management and investing in marine conservation. This can reduce environmental risks and ecological scarcity while improving human well-being. This year's slogan for World Oceans Day (8 June) 'Healthy Oceans, Healthy Planet' represents an opportunity to aptly summarize and raise awareness of the importance of seas and oceans in our ecosystems. It is important to recognize that today's fisheries are technologically advanced. In addition to significant improvements in navigation and fishing, the industry is using high resolution sonar, sound detectors, continuous temperature recorders, Inmarsat phones, highly innovative radio equipment, autopilot and electronic navigation systems, GPS and more. It is necessary to manage resources so that they are sustainably harvested and do not become extinct. Fisheries management, in accordance with national and international agreements and regulations, is the responsibility of each state authority and should aim at an appropriate and harmonious environment between fishing efforts and resource availability. They have a dual responsibility to protect fish stocks and ensure that fisheries are profitable. This means a very delicately balanced equation between the need for economic development and the need to ensure the future availability of these stocks. This is a very complex task. is due in part to natural variability in fish populations, and the influence of phenomena such as the El Niño-Southern Oscillation (ENSO) and global change cannot be ignored. These phenomena are the subject of intense research all over the world. As a result, fish abundances fluctuate significantly over time, affecting regulatory estimates. The second problem is the lack of knowledge to properly understand and correlate resource behavior with environmental variability. The above leads to the need for long-term environmental research to provide fisheries management decision-makers with the most pertinent information for promulgating appropriate conservation measures. Flumes also play an important role in this task, contributing various long-term data that enable the feed prediction models used by institutions. In short, fisheries have a wide range of potential users with whom hydrographers can develop interesting collaborations and relationships. However, these users demand quality products that are very practical for the various purposes mentioned above. Hydrographers generally use the advanced and complex techniques required. You should be able to meet these requirements. At the heart of the transformative response to decades of overfishing, pollution and unplanned coastal development lies a shift from sectorial management to shifting seemingly competing interests in marine and coastal resources and space into robust frameworks and spaces.