Species of fishes that can survive long periods without oxygen, perhaps relating BASTARD CARP to the right element of a「foreskin」as an unmistakable reference to a covering that deprives the covered flesh of oxygen, at times:
　「Crassius species exhibit some remarkable physiological adaptations to their environment. For example, in entirely anoxic conditions during winter Crassius crassius can survive for considerable periods by anaerobic respiration, with ethanol as the major metabolic end product. A facility that is highly unusual among vertebrates. During summer the fish also may survive anaerobic conditions by this metabolic expedient, though only to a far more limited extent. The winter phenotype can sustain fermentation as a substitute for respiration for several weeks on end. Experimentally the fish have been maintained under anoxic conditions for 140 days.」
　　[　https://en.wikipedia.org/wiki/Crucian_carp 2013-09-13　]　
　Men with peckers also can survive long periods with ethanol as the only source of sustenance. Note that SHAD resemble Asian carp or bastard crucian carp to an astonishing degree, and the two are often confused.
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.
　「Fishy foreskin」can be a case of「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　]

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)
Chinese: see 鰟鮍|鳑鲏, small carp