「Coarse shaft of raised rod vertical」that requires a COVERING, a SHROUD, to screen it from view.
　A shroud, or bamboo shafts woven into a curtain erected by the shaman to cover a precocious child providing services, not out of shame most likely, but to prevent other clients unable to control themselves and wait their turn from running over and interrupting the proceedings until full satisfaction was achieved. A covering or lined netting for use by females, to hold body parts such as breasts, or to hold a poultice, or to screen from others. Any relationship to a「basket for trapping fish, a basket held in water」seems to stem from the symptoms of a bacterial or parasitic vaginal infection of the 'wetlands' (see 鮅 as bacterial vaginosis, trichomoniasis and Chinese vocabulary uses), or as a reference to clients as「fish, suckers, wet and slimy slippery meat」and so on.
In its original parlance, describing a thing or situation as "smells fishy" did refer to having probable cause for extreme doubt and suspicion, but most folks do not realize why innocuous fish are so maligned in this manner. A fishy or pungent-smelling discharge from the vagina or penis may signify the presence of an infection, so caution was advised...and still is today.
　「Trichomoniasis (commonly referred to as 'trich') is the most common, curable sexually transmitted disease in the world. …Trichomoniasis is caused by a one-celled parasite, Trichomonas vaginalis. Trichomoniasis affects both women and men. The most common location of infection in women is the vagina, and in men it is the urethra. In women, the symptoms of trichomoniasis may include yellow-green vaginal discharge, fishy odor, pain during urination and sexual intercourse, and genital itching or irritation. Men usually do not show trichomoniasis symptoms, but some may experience discharge from the penis or burning during urination or ejaculation.」
　　[　link now-dead was https://www.trichomoniasis.org/ 2013-09-27　so instead see https://sacace.com/sexually-transmitted-diseases.htm　2023-05-17　]　 　
　Roughly one out of three women ages 14-49 in the United States develop a vaginal bacterial imbalance known as bacterial vaginosis (BV) during their lifetime. BV is characterized by unpleasant odors, and potentially painful side effects, as well as the risk of associated health issues later in life. 「Bacterial vaginosis (BV) is the name of a condition in women where the normal balance of bacteria in the vagina is disrupted and replaced by an overgrowth of certain bacteria. It is sometimes accompanied by discharge, odor, pain, itching, or burning. How common is bacterial vaginosis? Bacterial vaginosis (BV) is the most common vaginal infection in women of childbearing age. In the United States, BV is common in pregnant women. …Not much is known about how women get BV. …However, some activities or behaviors can upset the normal balance of bacteria in the vagina and put women at increased risk including: Having a new sex partner or multiple sex partners. …It is not clear what role sexual activity plays in the development of BV. Women do not get BV from toilet seats, bedding, swimming pools, or from touching objects around them. Women who have never had sexual intercourse may also be affected. What are the signs and symptoms of bacterial vaginosis? Women with BV may have an abnormal vaginal discharge with an unpleasant odor. Some women report a strong fish-like odor, especially after intercourse.」
　　[　https://www.my-obgyn.org/bacterial-vaginosis.php　]　
　　[　link now-dead was https://www.trichomoniasis.org/ 2013-09-27　so instead see https://sacace.com/sexually-transmitted-diseases.htm　2023-05-17　]　
　Bamboo strips were cut when green and pliable and woven into baskets. One of these uses was as a protective supporter, exactly as a codpiece was used in Europe and an athletic supporter with cup is used by male contact sport athletes today. The basket not only provided some protection against painful and unwanted contact of sensitive infected areas, but enabled a poultice filled with mashed grains and herbal treatments to maintain constant contact with the infected areas, provide deodorant functions, and hold absorbent batting.

Modern definitions (that generally disregard history) …excluding politically incorrect concepts and other meanings deemed offensive today; may list only pigeonholed definitions, euphemisms, or meaningless mnemonics)
Unihan extended: (same as 罩) a cover, a shade, a basket used to catch fish
EDRDG: a cover; a shade; a basket used to catch fish