욥기 41:22의 Tosefta

These are the signs of [permitted] locusts (Hul. 3:7): All that have four legs and four wings and two jumping legs, and its wings cover most of its body. Rabbi Yosei says, and its name must be "locust" (chagav) and not k'natzrin, which [also] have all these signs. Summachos says, even the mored. Rabbi Eliezer son of Rabbi Yehudah says, if it does not have [these signs] now but will grow them after a period of time, like the cholchazah, it is permitted. These are the signs of fish: All that have fins and scales (lit., "a coat of scales," see Lev. 11:9). [If] it has scales, you need not inquire whether it has fins [as every fish with scales also has fins (Hul. 66b:2)]. [If] it has fins but does not have scales, it is impure. What are they? Scales are what covers it (i.e., the fish) and fins are what it swims with. And how many scales must it have? Even one under its cheek or one under its tail. Rabbi Yehudah says, [at least] two scales. [If] it does not have [scales or fins] now but in the future will grow them after a period of time, such as the sultanit and the bake-fish (נפיא= ("אַפְיָין"), per Jastrow), it is valid. [If] it has [scales and fins] now but will lose them in the future when it comes out of the water, such as the colias and the pilmis, the siftayim and the tunny-fish -- ? [Note: The Tosefta is defective here but the Gemara (Hul. 66b:1) supplies "ה"ז מותר," "behold, it is permitted."] Rabbi Yosei ben Dormaska (alt., "Dormaskit," see Hul. 67b:15) says, the Leviathan is a clean fish, as it is said (Job 41:7-8), "His armor (alt., "scales") is his pride, locked with a binding seal / One scale touches the other, and nary a breath may enter between them," [and] "His underpart is jagged shards" (Job 41:22, JPS Tr.) -- these are his fins.