Determination of the maturity stages of marine fishe

Badrudeen, M

Bensam, P

Jayaprakash, A A

CMFRI Digital Repository

Proceedings of the Summer Institute in Recent Advances on the Study of Marine Fish Eggs and Larvae 14 JUNE to 3 JULY, 1989 ICAR CENTRAL MARINE FISHERIES RESEARCH INSTITUTE Dr. SALIM ALI ROAD COCHIN-682 031. CMFRl/Sl/1989/Pr.II DETERMINATION OF THE MATURITY STAGES OF MARINE FISHES By . ;•' .P, Bchsam, Principal Scientist, -." A,A, Jayaprakash Scientist (Selection Grade) and M. Dadrudeen Technical Officer (Central Marine Fisheries Research Institute. Cochin) (A) Aim; To determine the maturity stages of marine fishes based on eye examination, (B) Materials; (1) Unpreserved specimens of the species ip various length ranges. (2) Scissors, needles, scales, balance, note book and pencil. (C) Methods; (1) Cut open the abdominal cavity and spread out the skin sufficiently to permit a full view of the gonads. (2) Note down the approximate proportion of the gonad in relation to the volume of the body cavity excluding the other visceral organs, in percentages such as 15%, 20!;^ , 40%, 70% etc or 1/3rd, 1/2, 3/4th etc. (3) Record the unpreserved colour-of the gonad. (4) Determine whether based on the eye examination you can decide the fish is a male or a female; if so, record the sex. -2-(5) If it is not possible to determine the sex, you may record the fact as 'indeterminate'. (6) Record the texture of the gonad such as "flat", "blade like", "leaf like", "tubular" etc. (7) If it is possible to deterrrjine the sex, then repeat the above procedures with specimens of different size groups and group them according to approximate 'stages' based on eye estimation and in consultation with literature (vide infra). (8) Usually, the maturity stages of female marine fishes are grouped into seven Stages;- (in total spawners - isochronal seven to eight stages and in partial spawners heterpchronal, five stages)..; (a) Stage I — Indeterminate, occupying about 5 to 10% of the body cavity. . • (^ ) Stage II- Pinkish in colour, tubular and granular in appearance, occupying about 10 to 20% of the body cavity (early maturing), (c) Stage Ill-Pale yellowish in colour, developing eggs fairly visible, the whole gonad' •. occupying about 20 to 50% of the body cavity(matufing). (<^ ) Stage.. IV -Light"Pinkish in colcur, the eggs increasingly much more visible and the gonad occupying,about 40 to 70% of the body cavity, blood vessels prominent (late\maturing), (®) Stage V - Whitish in colour, eggs very well visible, not oozing out under gentle pressure and the gonad occupying 50 to 80% cif the body cayity (mature). o H) <+ :r fl) H) M « 3* 0) 3 a H-D* O 3 0) c+ C H H» D iQ 0) c+ Q) O ro tn • o H» e+ nr fD S (D H* iQ or ch o H, e+ ST O vQ O D D) a H* D H fO M 0) <+ H* O a «+ o <+ D* (Q H-O <+ 0) M rr < 0) rt- M O 3 • H •y H-cn H-CO H, o H c+ 3-O "O c H •c o (0 <T) O Hi a o <r»-fD H 3 H- a H* 3 iQ t+ 3" ro H Q) O 0) 3 a or o a ^ H, M d H- CL W S H- c+ 3- o o c+ rt- O 3 £U 3 D-^ fD M-iQ 3* O a cr ro •-h o H (!) T5 H ro en o 1 H fl) 3 o < o Q. 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N M 3 C3 O ,.d £+ C 3 O-fD H T5 H CD CO CO c H <T) • M 3 0) u r\ d rt- (» o ^ o H, rt-3" fD-cr o ex -< (1 0) < H-rt-•< aj 3 a +^' CO o H fD Q) 3 •< S 3- H- c+ fD M- 3 rt-3- fO 3 Qi rt-c H ra .««-x CO ci- D> O 0 < ^^ O o 3 a H- rt- H- O 3 V ct-3" fD O o 3 OJ a o o o d •a H-O CO d rt-O 3 Qj rt- C H H* 3 la QJ 3 a M Q) rt-fD 3 Q) rt-f- H H- 3 vQ CO c+ 0) o fD CO -"--v l-« M rt-3- H Q d iQ 3* M < • M 3 H- 3 o o M r^ d H £U. 3 a ci- 3* H' 3 M 3 flj •a •o (0 0) H CU 3 O m rt-3- H o d »a 3" fD 0) H M •< 3 Q) c*- d H 3 vO M 3 rt-3* fD O 0) CO fD O H5 3 cu M CD CO « rt- 3* CD rt- O CO CO 0) H fD d CO d cu M M ^ T5 CU M CD S 3- H- rt- H- CO 3* CO 3-O rt-H- 3 Qj •C3 •o fD fl) H Q; 3 O fD ^—X CO "O fD 3 rt- • CO o ^ o H> rt-3- (D cr o a •< o a> < M rt->< » H> M a> o M a «^ cr M O o a _^^ lO cn rt-cu a CD < M M i o < cu H •<: H fD a d o CD a M-3 < O M d 3 fD c+ O £U cr o d rt- to o rt-o cr o a •< n 0) < H" rt-•< >—s H H' T3 fD '• 7 ; Q) 3 a rt-3* O •o o 3 CU Q. o o o d •o. •<: H- 3 la ->j o ci- O X o o ^ o H) 3* CD CO cu la o ^ o o N H' 3 va o d rt-d 3 a fO H iQ fD 3 <r¥ _^^ H» cn rt-cu a o < M i m uO X3 CO ci- H QJ 1 3 00 cn 1 "O cu H CD 3 rt-tt H CD CO (D 3 cr M H- 3 M la fD T5 H CD CO cn d H fD o* o H-M (D a References CMFRI, 1970. The Indian Mackerel. Dull. Gent; Mar. Fish. Res. Inst.. No.24. Nair, R.V. 1960. Notes on the spawning habits and early life history of the oil sardine, Sardinella lonqiceps. Cuv. & Val. Indian J. Fish. 6s 342-359. Prabhu, M.S. 1956. Maturation of intraovarian eggs and spawning periodicities in some fishes. Ibid., 3 (1): 59-90. -Pradhan, L.B, and V.C. Palekar, 1956. Key to the stages of sexual maturity of Rastrelliqer canaqurta (C). Appendix I to the paper by Pradhan, L.B. on the 'Mackerel Fishery of Karwar*. Ibid.. 3(1); 183-185. Raja, B.T. Antony. 1966. On the maturity stages of Indian oil-sardine, Sardinella lonqiceps Val., with notes on incidence of atretic follicles in advanced .ovaries. Ibid., 13 (1 8.2); 27-47. 

Determination of the maturity stages of marine fishes

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Determination of the maturity stages of marine fishes

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