Table 1. Summary of the sampling, maturity stage and fin knob occurrence for each studied specimen.
| Specimen | Date | Area | Sex | Maturity stage (macroscopic) | Gonadal stage (histology) | Fin knob | MNA Code |
| Chha1 | 4Feb998 | TNB | M | 4 | Post-spawning | NO | MNA 5322 |
| Chha2 | 4Feb998 | TNB | M | 4 | Post-spawning | YES (detaching) | MNA 5323 |
| Chha3 | 4Feb998 | TNB | M | 4 | Maturing | NO | MNA 5324 |
| Chha4 | 4Feb998 | TNB | M | 4 | Post-spawning | YES (detaching) | MNA 5325 |
| Chha5 | 4Feb998 | TNB | M | 4 | Post-spawning | YES (detaching) | MNA 5326 |
| Chha6 | 1Jan013 | TNB | F | 2 | Pre-vitellogenic | NO | MNA 5327 |
| Chha7 | 2Jan013 | TNB | F | 3 | – | NO | – |
| Chha8 | 2Jan013 | TNB | F | 2 | – | NO | – |
| Chha9 | 2Jan013 | TNB | F | 2–3 | – | NO | – |
| Chha10 | 10Jan013 | TNB | F | 4 | – | NO | – |
| Chha11 | 10Jan013 | TNB | M | 4 | – | YES | – |
| Chha12 | 10Jan013 | TNB | F | 2 | – | NO | – |
| Chha13 | 10Jan013 | TNB | M | 3–4 | Spawning | YES | MNA 5328 |
| Chha14 | 10Jan013 | TNB | M | 4 | – | YES | – |
| Chha15 | 10Jan013 | TNB | F | 2 | – | NO | – |
| Chha16 | 10Jan013 | TNB | M | 4 | – | YES | – |
| Chha17 | 10Jan013 | TNB | M | 4 | Spawning | YES | – |
| Chha18 | 10Jan013 | TNB | M | 4 | Spawning | YES | – |
| Chha19 | 10Jan013 | TNB | F | 2 | – | NO | – |
| Chha20 | 10Jan013 | TNB | F | 3–4 | – | NO | – |
| Chra1 | 24Mar012 | EI | M | 1 | Immature | NO | MNA 5329 |
| Chra2 | 24Mar012 | EI | M | 3 | Spawning | YES | MNA 5330 |
| Chra3 | 24Mar012 | EI | F | 3–4 | – | NO | – |
| Chra4 | 24Mar012 | EI | F | 3–4 | – | NO | – |
| Chra5 | 24Mar012 | EI | M | 4 | – | YES | – |
| Chra6 | 24Mar012 | EI | F | 4 | – | NO | – |
| Chra7 | 27Mar012 | SSI | M | 3 | – | YES | – |
| Chra8 | 27Mar012 | SSI | F | 3 | – | NO | MNA 5331 |
| Chra9 | 27Mar012 | SSI | F | 3 | – | NO | – |
| Chra10 | 27Mar012 | SSI | M | 3 | – | YES | – |
| Chra11 | 27Mar012 | SSI | M | 3 | – | YES | – |
| Chra12 | 27Mar012 | SSI | U | 1–2 | – | NO | – |
| Chra13 | 27Mar012 | SSI | U | 1 | – | NO | – |
| Chra14 | 27Mar012 | SSI | F | 3 | – | NO | – |
| Chra15 | 27Mar012 | SSI | M | 3 | – | YES | – |
| Chra16 | 27Mar012 | SSI | M | 3 | – | YES | – |
| Chra17 | 27Mar012 | SSI | U | 1 | – | NO | – |
| Chra18 | 27Mar012 | SSI | M | 3 | – | YES | – |
Chha = Chionodraco hamatus; Chra = Chionodraco rastrospinosus; TNB = Terra Nova Bay; EI = Elephant Island; SSI = South Shetland Islands; MNA = The National Museum of Antarctica Felice Ippolito.