432 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [6] 
TABLE II.—Jncrease of the male sexual glands in percentage of the total weight of the body. 
[Fish of 3,500 to 10,500 grams. ] 
Per Per 
Date cent. Date cent. 
Mar Ml oe OR sie cide nciisisisicsslociciy= seistel ania O\DOSY |W Sept. L879 cece cecisicie selec esiesis/ sce 2.07 
May 3, 1880....-...------------+2 2-07 --- 0. 182 LS OTS yao sees nee Mata n-iee mcs siseiecee ee 4.91 
12) TIE Wioceeaaccoti@cocenccdderte cacccc 0. 099 TO MBPS sete ste -sscescitarcsle sais ieieinteaatersters 1.34 
Tse TUT) Re ie 0. 106 LOU TOTO 1 es A Oe ced oe ie 3.90 
RUIN OMS el One nietene cleteice tates elel= ara aeetee tet 0. 26 QO Sd aiaisiste S/o sieiereteheislerae etre ores, seer 9, 43 
ih BT) eaectaeanoabocdcroncoenooaae 0. 26 DART. eStee see eae ce ates ne eeeeee 1. §9 
Oy TE odoo, Bets Snae aan Sra cEece: 0. 23 PLR hy ERE Ree ee ner ee eee CCE noe 1. 54 
FN Te a a pee Le ater 0.31 26-1879 fish ne ie Nee eee 4.75 
Stliye eM OTS Sacco celerete te eninin= em alaale ine 0. 41 ZAR AO eae aprieecMedosee oe aemoodscacc os 5. 58 
PANTO MD GUSTO ste cjerelccels aie) 21" miminim mia) swiein's eebsal| (U5aE 7p GTA eno SAORaCCOOS REE SorOnds taScbe 4, 28 
IBY dV Wh Resbed cepa auaee oe DaSArunUcTcde 0.16 QB TGTS. dacceSace ce nie eismnae eee eee 2.3 
30, 1877. Sees we ohare 0. 90 Oct IsI876 55522 oc eueecees dee eee eh ed 5. 00 
PS EY cose paasdesconacaE odebacod ar | 0.59 UST O ORR eaten cee seer Eee ee 28.31 
DOV LO Uilisicis wale lala wloielaietonelmiainie(ajslolsisialsiei=] aia 1.57 ANSTO sas Sac cctndeaeleklocewe cei 5. 58 
DAL Sid po eieee a sieieiataietetein le cletereleiereeiserena= 0. 86 Gr S79 soe Sains coesiciccloe selele sso eae ciniase ail 
OST aad aaonoscipoconoooraEasdccec TAS TH STGsastecacsecee eee eee 3. 86 
BOM Siitiicceiet cis csceic(ists ies esis meeieiere 0. 43 WT 1ST 2s we cack ssscces sco ticles csieeeer +5. 90 
SOW Siilise ate ctevesie wie oaeeie = elacisivalsiciniowle 1.45 TD STS ee ctence ccs occic ce stoic cope ciseie eels 4. 34 
SGiNiS. 7+ HellfsSonoosUCrOnOOeepae Ee oomeeD oc 10, 48 1G) 1872 hos ex selac Hes wise see ob eeassineeiate 6.10 
SOU ST OMe ere See sale eices ceieieeetate 0. 82 1S. V8 Sivecie eee = Bie 4 Wee ae Ue isie sles Beye D256: 
ASTIRTOMURRNES A hie RSs Uy cckes ears 1. 180 |} Now. 9-4, ITO LEE eo). oem tee oeeiep tons eseeaees 4. 64 
\Few spots; small hook. 2Fish only weighed 4,350 grams. “October 14, 1872, 3.33, 
The October weights are equal to the weights of mature fish, very 
probably even larger, but contain less firm substances. The highest 
grades of maturity (November and December) have not been taken into 
consideration on account of the loss of milt. 
From these two tables it appears that during summer both testicles 
and ovaria of almost the same stage of development can show very con- 
siderable differences of weight. But the greater and lesser weights, each 
classed by themselves, can be chronologically arranged, and it will then 
be seen that the differences gradually cease with the females in August 
and with the males at the end of September and beginning of October, 
leaving those differences, however, which are found even among mature 
fish, and which, especially with the males, are very considerable. 
According to Mr. Glaser’s experience, which extends over many years, 
and which is corroborated by my own observations, extending over a 
period of eight years, the normal spawning season at Basel for. the over- 
whelming majority of all fish may be said to last from the middle of No- 
vember till the middle of December. From about the 1st of November 
Mr. Glaser keeps his fish alive in fish-boxes (tanks); at that time their 
ovaria do not emit anything when pressed. Generally about the 10th 
to the 15thof November artificial impregnation may be begun. As early 
as the 16th to the 24th of December it will be hard to find many, if any 
full females, and the occurrence of eight full females from the 5th to the 
13th of January, 1880, and of one as late as the middle of February, 
must be considered as rare exceptions, caused possibly by some irreg- 
ularity consequent upon the unusally severe cold. The occurrence of 
an empty female on the 26th of October, 1877, must also be considered 
as @ very rare case. 
According to my own observations, the maturity of the males sets in 
