World Fisheries Day, highlighting the importance of sustainable fishing and healthy aquatic ecosystems, is observed every year on which date?

Introduction / Context:
This question concerns World Fisheries Day, an observance that draws attention to the importance of fisheries, fish workers and the health of oceans, rivers and lakes. General knowledge exams often include this date because it is connected with food security, livelihoods and environmental conservation.

Given Data / Assumptions:

• The day in question is World Fisheries Day.
• It is observed annually on a fixed date in November.
• Several dates in different months are provided, including one correct November date.

Concept / Approach:
World Fisheries Day promotes sustainable fishing practices and awareness of the challenges faced by fishing communities. The approach is:

• Recall that World Fisheries Day is observed on 21st November each year.
• Use elimination to discard other dates that correspond to unrelated observances or no observances at all.
• Select the date that matches standard environmental and fisheries related references.

Step-by-Step Solution:
Step 1: Note that the question is specifically about World Fisheries Day, not World Oceans Day or World Environment Day. Step 2: Recall from environmental awareness materials that World Fisheries Day is observed on 21st November. Step 3: Scan the options for 21st November. Step 4: Recognise that 10th October, 29th September and 11th December do not match this observance. Step 5: Observe that 16th November is close but not the exact date. Step 6: Choose 21st November as the correct answer.

Verification / Alternative check:
Verification can be obtained from environmental ministry publications, fisheries department communications and trusted yearbooks. These sources consistently state that World Fisheries Day is celebrated on 21st November, with programmes focused on sustainable fishing, fish workers rights and aquatic ecosystem conservation. Media reports on that date also highlight related campaigns and events, providing further confirmation.

Why Other Options Are Wrong:
11th December: Not associated with World Fisheries Day. 10th October: Also unrelated to this fisheries observance. 29th September: A date used for other observances, but not for World Fisheries Day. 16th November: Close to the correct date but still incorrect; it serves as a distractor for those who only remember that the day falls in mid to late November.

Common Pitfalls:
Candidates may confuse World Fisheries Day with World Oceans Day or mix up its date with other environmental observances that occur in late November or December. Another mistake is to choose 16th November simply because it sounds familiar. To avoid this, it helps to construct a mental link between 21st November, fishing communities and sustainable fisheries, and revise that association along with other environment related dates.

Final Answer:
World Fisheries Day is observed every year on 21st November.