expenses. Voyage expenses also included port expenses of $0.4 million for the six months ended June 30, 2021, corresponding to 21.1% of total voyage expenses, and commission to third partieswhich were $0.3 million, equivalent to 15.8% of total voyage expenses for the six months ended June 30, 2021. For the six months ended June 30, 2020 our spot charter activity was limited hence total voyage expenses amounted to $0.8 million.
VESSEL OPERATING EXPENSESVessel operating expenses were $3.7 million for the six months ended June 30, 2021 compared to $3.4 million forthe six months ended June 30, 2020, an increase of $0.3 million, or 8.8%. The increase in operating expenses was primarily due to the reduction in the number of our vessels on bareboat, since under bareboat charter arrangements we are notresponsible for vessel operating expenses, and crew expenses related to COVID-19.
MANAGEMENT FEESManagement fees were $0.3 millionfor the six months ended June 30, 2021 compared to $0.2 million for the six months ended June 30, 2020, an increase of $0.1 million or 50%. The increase was due to the reduction of vessels under bareboat charter arrangements. The daily managementfees per vessel did not change during these periods and remained at $440 per day for vessels under time and spot charter and $125 per day for vessels under bareboat charter.
GENERAL AND ADMINISTRATIVE EXPENSESGeneral and administrative expenses were $0.2 million for the six months ended June 30, 2021 and $0.1million for the six months ended June 30, 2020.
DEPRECIATIONDepreciation expenses were $4.3 million for each of the six monthsended June 30, 2021 and six months ended June 30, 2020, respectively.
NET LOSS/PROFITAs a result of the above factors, we recordeda net loss of $1.2 million for the six months ended June 30, 2021 compared to a net profit of $0.1 million for the six months ended June 30, 2020.
Year ended December 31, 2020 compared to year ended December 31, 2019
The average number of vessels in our fleet was 4.0 for the year ended December 31, 2020 and the year ended December 31, 2019,respectively.
REVENUESVoyage revenues for the year ended December 31, 2020 were $ 20.3 million compared to$13.3 million for the year ended December 31, 2019, an increase of $7.0 million, primarily due to higher revenues stemming from our time charter contracts along with a reduction of our bareboat activity, as our bareboat days declinedin 2020 when compared to year 2019 by 49.3%, Total calendar days for our fleet were 1,464 for the year ended December 31, 2020 compared to 1,460 for the year ended December 31, 2019. Of the total calendar days in 2020, 446 or 30.5% werebareboat charter days, 615 or 42.0% were time charter days and 356 or 24.3% were spot days. This compares to 880 or 60.3% bareboat charter days, 569 or 39.0% were time charter days and 7 or 0.5% spot days in 2019. Our fleet operational utilizationwas 95.7% and 99.7% for the years ended December 31, 2020 and December 31, 2019, respectively.
VOYAGE EXPENSESVoyageexpenses were $3.2 million for the year ended December 31, 2020 compared to $0.6 million for the year ended December 31, 2019. This increase of voyage expenses by $2.6 million is attributable to the increase of spotpresence. For the year ended December 31, 2020 our spot presence was 356 days compared to 7 days in the year 2019. Voyage expenses consisted largely of bunker charges amounting to $1.6 million for 2020, accounting for 50% of total voyageexpenses. Voyage expenses also included port expenses of $0.8 million for the year ended December 31, 2020, corresponding to 25% of total voyage expenses, and commission to third parties which were $0.5 million, equivalent to 15.6% oftotal voyage expenses for year 2020. For the year ended December 31, 2019 our spot charter activity was very limited hence total voyage expenses amounted to $0.6 million which are significantly lower compared to the voyage expensesincurred for the year ended December 31, 2020.
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