| 2025-01-05 | Bit of plankton |
| 2024-12-17 | Bit of pond scum |
| 2024-11-25 | Bit of pond scum |
| 2024-10-20 | Aquarium growth |
| 2024-07-15 | Pond organism |
| 2024-06-23 | Plant in a bloom |
| 2023-08-26 | Plant that contains chlorophyll but lacks a stem and leaves |
| 2023-07-16 | Simple pond organism |
| 2023-05-14 | Chlorophyte, e.g. |
| 2023-03-17 | Bit of film |
| 2022-09-20 | Growth in an aquatic bloom |
| 2021-01-10 | Plant used in making biofuel |
| 2020-12-31 | Plant that lacks true roots and leaves |
| 2020-08-23 | It helps turn a pond green |
| 2020-07-06 | Bit of seaweed |
| 2019-09-07 | Film bit |
| 2019-03-25 | Bit of pond growth |
| 2019-02-20 | Bit of pond scum |
| 2018-09-02 | Simple plant |
| 2018-08-16 | Lichen component |
| 2018-08-11 | Word from the Latin for "seaweed" |
| 2018-06-20 | Bit in a fish tank |
| 2018-05-02 | Seaweed, e.g. |
| 2018-04-26 | Pool growth |
| 2017-12-10 | Pond growth |
| 2017-09-19 | Birdbath organism |
| 2017-05-27 | Fountain growth |
| 2017-05-23 | Pond organism |
| 2017-01-25 | Bit of birdbath gunk |
| 2016-04-24 | Bit of pond slime |
| 2015-10-07 | Bit of fish food |
| 2015-08-09 | Bit of marine life |
| 2014-12-22 | Simple aquatic plant |
| 2014-09-28 | Bit of seaweed |
| 2014-09-14 | Aquatic organism |
| 2014-05-18 | Bit of stagnant-water growth |
| 2013-10-20 | Sea grass, e.g. |
| 2013-10-13 | Film bit |
| 2013-10-12 | Morsel for a guppy |
| 2012-03-28 | Sea lettuce, e.g. |
| 2011-12-18 | Unwanted swimming pool bit |
| 2011-11-25 | Mussel morsel |
| 2011-04-18 | Bit of plankton |
| 2011-03-06 | Pool organism |
| 2010-04-03 | Bit of rootless flora |
| 2009-11-25 | Pond organism |
| 2009-08-10 | Pond organism |
| 2009-08-02 | Pond organism |
| 2009-07-07 | Sea lettuce, e.g. |
| 2009-02-08 | Aquatic organism |
| 2008-03-26 | Bit of aquarium growth |
| 2007-10-10 | Kelp, for one |
| 2007-10-08 | Pond organism |
| 2007-06-27 | Bit of plankton |
| 2007-01-13 | Chlorophyll-containing microorganism |
| 2006-07-27 | Bit of scum |
| 2006-04-23 | Sea lettuce, e.g. |
| 2006-04-20 | Aquatic plant |
| 2006-01-24 | Pond organism |
| 2005-11-10 | Tiny ponddweller |
| 2005-10-09 | Pond plant |
| 2005-06-15 | Aquarium growth |
| 2005-05-30 | Pond organism |
| 2004-08-14 | Eukaryotic organism |
| 2004-07-04 | Lowlife? |
| 2004-06-23 | It lacks roots |
| 2004-04-28 | Pond floater |
| 2004-04-13 | Aquatic plant |
| 2004-03-07 | Tiny organism |
| 2003-06-18 | Sea moss constituent |
| 2002-08-29 | Bit of seafloor flora |
| 2002-05-21 | Seaweed, for one |
| 2002-04-09 | Pond organism |
| 2002-01-13 | Morsel for a sea snail |
| 2001-07-12 | Bit of ocean flora |
| 2000-05-31 | Pond dweller |
| 1999-12-09 | Bit of plankton |
| 1999-08-04 | Water growth |
| 1999-06-21 | Microscopic organism |
| 1997-07-19 | Foot of a food chain |
| 1997-06-12 | Chlorophyta bit |
| 1997-05-18 | Marine ___ |
| 1997-05-08 | Stonewort, e.g. |
| 1996-11-04 | Tiny aquatic plant |
| 1996-04-16 | Pond organism |
| 1995-08-03 | Pond dweller |
| 1995-06-18 | Bit of Chlorophyta |
| 1995-06-16 | Pond organism |
| 1994-10-23 | Bit of kelp, e.g. |
| 1994-10-09 | Microscopic life |
| 1994-05-08 | Microscopic organism |
| 1994-02-08 | Spirogyra or frog spit |